Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf6d98fdee96fa1…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 14:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09b84989341c3691be221da5e435cc96 SHA-1: b0eb65fc417747628053f79c449f76107ae626ad SHA-256: aaf6d98fdee96fa1a1670f0b12c53f1a1f6e497be144f4fe37a8b5dfe5e296d1
264 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The heuristic 'SE_CALLBACK_LURE' specifically suggests a callback phishing or tech-support scam pattern, where users are prompted to call a number. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=sharkhide+metal+protectant+spray In PDF document text
    • https://cdn.sqhk.co/zimuteraf/hcMRjip/twitter_pobelter_girlfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/eNjaihY/totomuzude.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/gc7WvOV/sumixudasejetavuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/di1TZlT/10824727186.pdfIn PDF document text
    • http://befelofote.iblogger.org/building_design_plan_and_elevation.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/i4tjbgd/chincoteague_diner_restaurant_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dbPohdm/best_status_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pomijatan/VgddVii/rubber_chicken_song_bohemian_rhapsody.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/bgh5iby/31304990973.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/ifBOidd/plants_vs_zombies_heroes_download_free_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/jggNijN/ultimate_wolf_simulator_2_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/hdIpgga/rush_hour_4_full_movie_youtube.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
    • http://karimelu.rf.gd/xowovavotigopidojiz.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/37143957351.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/86807705897.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_b71ea1948ad848348d4945cfa642d01d.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_1b70209bdf064250a6bdcc0fab3a9744.pdf?index=trueIn PDF document text
    • http://lojupodinitaxug.epizy.com/kidakezebuwuwuzizedipe.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/68620894888.pdfIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_07063f6bfbc14e279dac471adc3738f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liluvad/delivery_receipt_template_doc.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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5368 bytes
SHA-256: a8eef8ce0085ad6dc88eda443d23f0219c96aa1557587001de12e874b35a4139
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11012 bytes
SHA-256: 97a40cbe290a2babfbe10f413b9dfb31d60af6fcf7857ffb51044d6186ac261f
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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