Malicious PDF — malware analysis report

Static analysis result for SHA-256 9398e38f8ee738dc…

MALICIOUS

PDF

80.1 KB Created: 2021-03-28 05:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cf01c17e70ca227043c76ccf374ed673 SHA-1: 8049d09acebeaad2e63caeb75c4fefd4fc36c176 SHA-256: 9398e38f8ee738dcccd8a4f8adf398530e57996b682fbf98d978465b849b5e5e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. The document body, though partially corrupted, contains a URL that aligns with the link farm heuristic, indicating a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/123?utm_term=how+do+keloids+form+on+your+ear PDF link annotation
    • https://cdn.sqhk.co/ropobemuma/gWiaxjd/32891219017.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/dasovusevo-mudiwufif-nigifumored-lenifugulonetus.pdfIn PDF document text
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/b690e402c4.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/62904268191.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/gjbiiii/history_of_christmas_tree_lights.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/chaganti_koteswara_rao_books_free_download.pdfIn PDF document text
    • https://xekitagib.weebly.com/uploads/1/3/4/6/134668592/sixezajuluxipos.pdfIn PDF document text
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/taponezamat.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/pawusilav_fijotutupij_sesotum_jorovajuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/pidEhhR/83082621525.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/auxiliary_verbs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/zatakabe/agcdQji/sensory_neurons_carry_information_to_the_brain.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/edit_content_in_word_online.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/dhjig46/best_app_to_translate_english_to_chinese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_acb99155cc944d6e9254e0158f639994.pdf?index=trueIn PDF document text
    • http://megigezorozo.atwebpages.com/77736400760.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/cara_bikin_surat_lamaran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04152e80-8310-4fac-be8d-9e4238204c38/99040184799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db800801-d6e9-47f7-92ad-7ddc6743f17c/21264007774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4335545e-7536-4dab-9285-1ca2c2a5cdd8/front_page_newspaper_templates_free_download.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_1bda21a68c464a8b82ea39a14b99c2a4.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_01dd8e1ed94840c0b65b41421af84d8c.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_135522220f3d4715ac5fc1fad1a37a6b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 5076 bytes
SHA-256: 16e720e20a96e88fc36a00cd242c5f3f979e8da6a54c1b21c7c79cdd52d4038b
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10892 bytes
SHA-256: 264e5b89ac84223166909c61159c0f2b76eefbcba16d246ced665077cdeefd8f
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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