Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1802f21f406990f…

MALICIOUS

PDF

82.8 KB Created: 2021-03-27 21:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 97bb9b6278c188f3a3cd83f930c92c65 SHA-1: c8ea4b9ada12f1fb7f490f31e7468586a840946f SHA-256: c1802f21f406990f81cee5c65be90a34a6fcf0790b71da5c0a32cf6e185b77b4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to benign resources, but one key URL, 'https://xajibur.ru/strik?utm_term=mcp61pm-hm+bios+update', is identified as a redirector for a free-download phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure suggests an attempt to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=mcp61pm-hm+bios+update PDF link annotation
    • http://gebuhrenfrei-mein.com/cluedo_detective_notes1fxlj.pdfIn PDF document text
    • http://connexion-amelii.xyz/the_magic_flute_synopsis_metropolitan_opera4ssmg.pdfIn PDF document text
    • http://swiss-gear.shop/gamemaker_studio_2_game_optionsgfz63.pdfIn PDF document text
    • http://shop-you.xyz/vawumaloragegunib6frz0.pdfIn PDF document text
    • http://natur-green.fun/851275293340dgn5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/electrical_engineering_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/introduction_email_template_to_colleagues.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_7b1c0bad85b64a3f9a230388c5698c69.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_a37d1bf0de4f46cfb6eb92e7d6a68c3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/58483701549.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/detodedagupadapofogu.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/ragutudufalinogibujirina.pdfIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_c45c5cf459474dd686a125723bc6d117.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_24e6391e7c57476daba4975f4d168887.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_e175c428979f4f5eac2ea568a2f501aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/36198851433.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/bamupuberizup.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_4ea6b35d321b477bbe2b41a047f06bfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/createspace_formatted_template_5_x_8.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_64a794de37e442f884dfc13f6c366229.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widetunipet/609318415.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/tediwevovaxe.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_96bc2de941214f5dbf7edcf806b8e1f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/19942636961.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/facebook_videos_private_url.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/29163310109.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_d511c01f52df4f5da4f0e7484b677f07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/ariston_washing_machine_manual_arm7l105.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 5568 bytes
SHA-256: 25fc87ab757b1641e68d83f6c13ec6ed56a9e0b369eddd22e7c5aafcc718a80e
font_01_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10852 bytes
SHA-256: fa6dff60b72f438a2164b941e5282f560d8d519b8c4749befbb51159a3c5d1c3

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