Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc0063426769c45…

MALICIOUS

PDF

75.2 KB Created: 2021-02-16 18:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 04bb74aefe321568c3c8d7ab1b1a254c SHA-1: 38a56c1a6c369f42e571c3bb2363ad111d2e0cfc SHA-256: afc0063426769c4557ea3070a66124c4ccca846fa83495cf863074380d5b760c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection suggest this PDF is designed to lead users to malicious content, potentially for phishing or malware distribution.

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://yafferge.ru/strik?utm_term=how+often+to+drain+lg+portable+air+conditioner In PDF document text
    • http://jijimaxugixu.22web.org/57719323803.pdfIn PDF document text
    • http://tryplafond.xyz/15906288506ko95t.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/bYgdbY3/norokabasolomiso.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/gejdmgj/pezobojomikopatibosuginog.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jfQlsLp/30342249946.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/giCfNhd/slingshot_ride_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/bUgdzij/zonavixejadudumufowofaz.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/8524638.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/1403829.pdfIn PDF document text
    • http://tk-time.site/sword_art_online_alicization_rising_steel_tier_list252cj.pdfIn PDF document text
    • http://top-shop-store.website/greatest_rock_songs_of_all_time_youtubebnqix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_6023698bace45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5ff7ccdc039f4.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_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 5128 bytes
SHA-256: b082c0a855e42420e26ff206309878d0c5bee23443814f05e5be2aab8a048375
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 10808 bytes
SHA-256: 828017dbe60fbecaab7ef4e2f8993253546d98f00798617bd3fad91c3cb4e682
font_02_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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