Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a17551f982bac4…

MALICIOUS

PDF

84.0 KB Created: 2021-03-14 08:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 26df58359931836ce8972755b6f41406 SHA-1: f2f90affdccdf7edcb6a3e5d634d5da9d91f1574 SHA-256: 92a17551f982bac4dfcb3c8ebabf95c8c3769808277a3c77a694bcdae6a9beb8
244 Risk Score

Malware Insights

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

This PDF is classified as malicious and contains a large number of embedded URLs, many of which point to disposable hosting and are likely part of a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and mentions "typhoid in pregnancy pdf", likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=typhoid+in+pregnancy+pdf In PDF document text
    • https://cdn.sqhk.co/kopilixa/hedTghQ/definition_failing_to_report.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupesiparu/s1jinhf/91599787957.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/MYgiYig/72317214410.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/ghgDShb/38117880559.pdfIn PDF document text
    • http://skidki-day.store/what_can_you_give_a_teenager_for_anxietyjpppo.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/2MjfggV/gixusivutubujetavasivu.pdfIn PDF document text
    • http://starkrobotics.org/444936358913ppi0.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/6geRgmh/web_for_instagram_with_direct.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/APheihi/pete_the_cat_my_buttons_song.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/ciigtha/toca_lab_plants_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/7Ejfjgg/knife_master_money_game.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://uploads.strikinglycdn.com/files/599038a6-92f0-484a-9b1e-75f1e7c1c347/how_to_factory_reset_jbl_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3f467e-5809-449f-90a8-f372289d25fc/56980814804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04ae4cd-aa30-42e3-8dd5-0143074a9f6f/dukefawi.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_8656349fd2ea426fab1b0e93f336e722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aaffddf-47ce-49e4-95f9-36d5a1017fc3/cantos_de_la_iglesia_de_jesucristo_delos_santos_de_los_ltimos_das.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/fibemapibulenasoralixe.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/dazawipidiliwesadaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315d2328-de28-46c6-8133-f893867be18d/peximaxipovoxagisorenalox.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_b0c2e2d029b14386a4356324dcf231dd.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_1270c234729b4cf1a8d6d0d62e0f0b8b.pdf?index=trueIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_2e18abdf95df406c899e760d082e97cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/conference_flyer_template_indesign.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/active_and_passive_voice_imperative_sentences_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/budget_planner.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 4968 bytes
SHA-256: 0f327bd68dd8975ef87f58f8e4720c305aa1e62d701a296b43e913838de8975e
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 10904 bytes
SHA-256: 25c5ea85a2666385e79cc6ca00a7eebe08bda26222a7ea6c38e12afcbfbface2
font_02_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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