Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ed7f34b6a57385…

MALICIOUS

PDF

74.7 KB Created: 2021-03-12 21:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 731477c255fa728d2630feeb0915f410 SHA-1: 811ea7f340582f1d9f1c34fa84e1b236ab4dd7b8 SHA-256: 93ed7f34b6a57385a8faae063b65d51595a9a48c34a5e378d572e43f0f58a714
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=articulation+skills+pdf PDF link annotation
    • https://cdn.sqhk.co/xupodafib/giKLjfS/zombie_roadkill_3d_apk.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/sciatic_pain_exercisesdxdrs.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/67126468239.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/83866598452.pdfIn PDF document text
    • http://dezlice.ru/puwezuzuvuxifokq4lyx.pdfIn PDF document text
    • http://lightsex.ru/dibepedoserenimkfig.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/8uiggg1/bowling_speed_application.pdfIn PDF document text
    • http://rogevunesopu.medianewsonline.com/xonifinupuguralewo.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/1c4hjCv/51206501721.pdfIn PDF document text
    • http://megantv.site/what_are_nec_codesjlq4p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9dfeb2-52cd-47ae-bb9e-67b772d82c07/13759446875.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/26422597153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d01b7e3-9b8d-46ce-a392-bb3fd7879f37/ruzepip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b79765-89af-43da-acd6-c29cbc4aea86/oasis_water_filtration_cooler.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_01698220e8b94e118e5568ce29adcd1d.pdf?index=trueIn PDF document text
    • http://woxesizefibugel.atwebpages.com/34421886519.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_32085c526de847b0b02952314c337d8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3504b52-d8d3-45ca-84fb-6f251b3523b9/how_to_use_a_manual_wind_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8f98ad-1d80-4994-9dff-75815120e211/what_happens_in_chapters_1-3_in_lord_of_the_flies.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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5200 bytes
SHA-256: 0f72357ffa8cacd458202ad4f88718b76c9d62b9cd2c533ee3c2d39b9bbaf635
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 10496 bytes
SHA-256: 3586381b66c87a03620dc2b8613589b445e8d676437a122a206d11a1bec39ecd

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