Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a69416288fdb07e…

MALICIOUS

PDF

104.4 KB Created: 2021-05-12 12:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 277bda223a974613bc372b73c1d9558f SHA-1: 5053546fe089e78d7f6cac4a9b399cc534394f6a SHA-256: 5a69416288fdb07e3663cf470ebfb26b7419e41ae9d8051c808c5370ef04fb3a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content, such as the PDF at http://universityru.fun/geog_2_textbook_answersnpjqv.pdf. The document body, though heavily obfuscated, contains keywords related to 'wordpress user management themes' and the authoring application, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=wordpress+user+management+themes PDF link annotation
    • http://universityru.fun/geog_2_textbook_answersnpjqv.pdfIn PDF document text
    • https://cdn.sqhk.co/lolitubafo/hggfjbq/35846443212.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/DVhaggm/nupolobijapulopumabunel.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/YijsSCN/top_100_songs_2010_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/g0FIhcM/funny_non_veg_videos_for_whatsapp_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/IijaB1P/12862331762.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/hcfkwKS/fesab.pdfIn PDF document text
    • https://cdn.sqhk.co/lazogapuvo/ejbLjiV/vepabipitolikiviw.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/ewSifJf/sea_monster_city_apk.pdfIn PDF document text
    • http://nazhivy.net/ashtalakshmi_stotram_lyrics_malayalamggd45.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/jemisajoda/echo_power_blower_pb-250ln_parts.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_e55ee2a42ccb4c72843b7cb8bcd55842.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/1042291570.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_251c37749a2b40ab83b7bf7104567117.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/john_deere_mower_seat_cushion.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_a0d5cc9add3b4577a143b4ddc89f031b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/24367679223.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/45763147089.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_off00015cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB0 5356 bytes
SHA-256: e089e0b3a02aaec18a8dc3a5c7ae5e89bc1f324aa584c07d56bd705b9fb702fc
font_01_sfnt_off00016ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC6 11188 bytes
SHA-256: 863f38e587488ed584b9c3e411f22b0db7889b0c0911118c6357a2cc62ed5db6

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