Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdac7e44dfd132db…

MALICIOUS

PDF

80.7 KB Created: 2021-03-13 13:31:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ab52fbef8bbbb02fcf7a8e18cc68548 SHA-1: 55f418c20c6647642ec42c995210c3f2ea5210e1 SHA-256: fdac7e44dfd132db95b426edf3c43d953b10900f62b55d74c19b05406222d526
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDFs, likely for SEO manipulation or to distribute malicious payloads. The presence of a `utm_term` parameter in one of the URLs suggests an attempt to track user engagement with the lure content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/aws?utm_term=what+are+word+forms+in+english PDF link annotation
    • https://cdn.sqhk.co/zibumimuw/3wifJWz/elixir_syntax_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/jcTJWmw/taylor_gs_mini_vs_big_baby_review.pdfIn PDF document text
    • http://rokamik.iblogger.org/monthly_meal_planner_template.pdfIn PDF document text
    • http://dusosax.66ghz.com/pijisujewapi.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/d2SjiUD/vmware_multi_cloud_briefing.pdfIn PDF document text
    • https://cdn.sqhk.co/legesizas/jho2wnY/christian_music_with_lyrics_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/VsjjRDf/dc_comics_batman_villains_list.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/jumpsuit_dress_making_pattern.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/denon_avr_x2200w_specs.pdfIn PDF document text
    • http://josogub.iblogger.org/xoxodusisadizaj.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://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_6179e399912b44ed84ed65db2ced85bf.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_a72c0b512607480db482609128a7f809.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/75277419526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e62aae0-81d5-4675-be4e-8c52bbb96abd/ccna_security_salary_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d720c93-f556-44be-9e2a-b9e4d7d35f4e/decolonize_your_diet.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_7ab712a16def45c18c0b8cf77e217def.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3a863b-24f6-428c-bf68-e28670a3ec4f/les_vacances_du_petit_nicolas_film_complet_en_francais.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_651ff2c894824467a0dc97f50a88001c.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_ada592ba10e7436cbf9ba1bd9e154b3f.pdf?index=trueIn PDF document text
    • https://cdc289ba-f3ed-427b-87f1-ac000799fba1.filesusr.com/ugd/84a5c6_3208365082a64d1e8e8b63e0f011ea97.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_04e3f918ab594cdea8f04b69e6d820a6.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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5216 bytes
SHA-256: d8ef0bcf6b3f71953685d6620c3ae49e03a573719579190aa0f2e4e82a178bd6
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 11168 bytes
SHA-256: 7c4840f225e7f6a436c9169fe111277748899e32d53b4b238d6e974c94fd4a2c
font_02_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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