Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75aa4fb74c029b7…

MALICIOUS

PDF

68.5 KB Created: 2021-01-09 22:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2b93c82b01f7af4b4b0a9e0e9510946b SHA-1: 91ed90619ffde40bf6e0339799c07a999a890a4a SHA-256: a75aa4fb74c029b7806ffff301bb23ad59097831fd02e15b690c3829fa07d98b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a link farm with 28 external links, many of which are SEO-optimized and hosted on disposable infrastructure, designed to redirect users to various unknown PDF files. One of the primary links points to a known malicious redirector infrastructure, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://gettraff.ru/aws?utm_term=2010+chevy+malibu+ltz+owners+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fda8706098c3.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/Ixjdfhh/helicopter_for_sale_texas.pdfIn PDF document text
    • https://site-1175937.mozfiles.com/files/1175937/brawl_stars_twitter_frank.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5fb578b7c5aa6.pdfIn PDF document text
    • https://site-1173658.mozfiles.com/files/1173658/91602189163.pdfIn PDF document text
    • https://site-1174987.mozfiles.com/files/1174987/download_the_survival_hunger_games_2_mod_apk.pdfIn PDF document text
    • https://pixogapowirotuj.weebly.com/uploads/1/3/4/6/134641161/8b781d52f9b1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fe422425f66f.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/hiGig5h/interesting_facts_about_meerkats_ks1.pdfIn PDF document text
    • https://site-1176339.mozfiles.com/files/1176339/amazon_prime_video_customer_service_phone_number_usa.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/wingstop_coupon_5_off_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/f0ibCjf/sightseeing_experience_florence.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/QjbCsXi/best_homemade_ice_cream_recipes_cuisinart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_5fb491b881330.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://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_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 5596 bytes
SHA-256: ff238a4903e5d77fc2ef0a2238a3f692c16876d9d021d28242b85a553357354d
font_01_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 8648 bytes
SHA-256: 671b650df859a970daca1b21917566e1dfec039ba556acfbd1c564c7a0995bb4
font_02_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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