Malicious PDF — malware analysis report

Static analysis result for SHA-256 306141b582a875a1…

MALICIOUS

PDF

69.6 KB Created: 2021-03-15 22:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0734e7d0f6aa875631fa1c8bd300cb8b SHA-1: 9120279fb14788c00df660d71d13f7cf41ecebda SHA-256: 306141b582a875a1b741503192f7b0916d603227f8b62801e43d52d273cd7587
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 pointing to disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML heuristics confirm the malicious nature, with the ML classifier outputting a high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely using spearphishing as the initial access vector.

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://jottigo.ru/wb?keyword=international%20business%20geringer PDF link annotation
    • https://cdn.sqhk.co/xolofiwano/tgdTjck/36377008340.pdfIn PDF document text
    • https://cdn.sqhk.co/rewufarelaze/heshh7a/lullaby_songs_hush_little_baby_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/vapadexeb/cfi6ZHu/microsoft_bookings_api_example.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/ij3gjgg/11051407830.pdfIn PDF document text
    • http://iqecoportal.ru/wuvalijabimitepenin6ii6c.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/iccibcv/vr_dead_target_zombie_intensified.pdfIn PDF document text
    • http://wiinorama.fun/sowivajefikupari62ati.pdfIn PDF document text
    • http://servempieza.site/what_is_special_personal_auto_policyudlme.pdfIn PDF document text
    • http://neuroncraft.online/feminist_theory_from_margin_to_center_summaryyka0e.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/jaigGJP/35717127198.pdfIn PDF document text
    • http://brumbum2.xyz/85305789196e72yu.pdfIn PDF document text
    • https://cdn.sqhk.co/baxulamuva/ixxjacD/nikaf.pdfIn PDF document text
    • http://umniashka.ru/66286213977k9xoj.pdfIn PDF document text
    • http://mantenancie.com/eric_berg_food_chartauhal.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/SWjjgho/81227342793.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/Z040hdR/nesasuxejiro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_5255922c77964403b451bc286c43a05f.pdf?index=trueIn PDF document text
    • http://revisinek.epizy.com/67282350147.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_5a95a6f7bd9f43b887f4d76666aefff5.pdf?index=trueIn PDF document text
    • http://lojajute.rf.gd/68116053594.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_34ebe63dc6374e89934469a1db580697.pdf?index=trueIn PDF document text
    • http://mesesoriran.epizy.com/zuvinor.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_ef4c8aee6df24fe68f1cf7278c8948fb.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_753d3d36b9b04b29bc11461a67dc74fe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 4932 bytes
SHA-256: cfd818f9faaf73a865e835434d1fe48ff5f6ade3ce4e0334f9022b2737f0369c
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 10532 bytes
SHA-256: 37abebeb57ccb123558a053962a564da62d29559379e640138f2f1bd5787d40c