Malicious PDF — malware analysis report

Static analysis result for SHA-256 37adf9a2de040843…

MALICIOUS

PDF

76.6 KB Created: 2021-05-17 02:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7b58705abcd0b7a043b53aa606865c45 SHA-1: 7c3276183e8ea1bb0840015a9261ad304d848de6 SHA-256: 37adf9a2de0408437ff8483f6ef32eb426a9da5264825dba9f78e923be4a593b
244 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, with one specifically identified as a redirector to a known malicious domain. The document also exhibits characteristics of a link farm hosted on disposable infrastructure, suggesting a phishing or scam attempt to lure users to malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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/strik?utm_term=being+and+time+heidegger+pdf In PDF document text
    • https://cdn.sqhk.co/webunojixisa/UjaMlSJ/nosetew.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/jdhfhiV/52680654592.pdfIn PDF document text
    • https://cdn.sqhk.co/naxokujim/jhjeXjb/29565142071.pdfIn PDF document text
    • https://cdn.sqhk.co/neganobasiwe/gfgja9w/fall_foliage_report_2019_michigan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_604d34d73b488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5ff3bef6e4201.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/huHhahi/download_major_mayhem_2_cheat_mod_apk_happymod.pdfIn PDF document text
    • http://tujubafi.getenjoyment.net/calcolo_vani_catastali.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/diSicjb/93598205109.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/2ifgjlp/42190524898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe43451ea9a3.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/ibGJs5S/17309937133.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/80771020875.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/gd8hcog/xukikupodumi.pdfIn PDF document text
    • http://punejew.mygamesonline.org/lier_2_pages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_6068b65c7f5d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_c43ee18a20884878864e2d6b7cf85bbd.pdf?index=trueIn PDF document text
    • http://zonurupadul.atwebpages.com/adcirc_manual.pdfIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_b7ca35a3928b4cad9c47dec5cee381d2.pdf?index=trueIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_5df33d9cea65433c8f47d7f67daaaca6.pdf?index=trueIn PDF document text
    • http://jorasixu.myartsonline.com/bill_nye_sound_video_worksheet_answers.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_86f45191f077425e86068f7d744233ec.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_23b33e29fedc4b019a2506dbc6009dfb.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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5296 bytes
SHA-256: 6c2a3980eedb843680e8de3363cae7dfa7fa18b6f605db22174be25a64233e01
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 11316 bytes
SHA-256: 44f61337d4893092829467cef8afc8c6ebfea0d1d3f78586a304beb555e2a235