Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbd36bafce1ff74…

MALICIOUS

PDF

74.4 KB Created: 2021-03-31 10:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c1095a44c77e7301c20552eaea1ea5d SHA-1: e33abcb72bf64743ef0339b0971c621d82f3d70c SHA-256: abbd36bafce1ff740cf78b00a2ae249b09c511702852744e1eef74b99b116083
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'golowaki.ru', suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://golowaki.ru/123?utm_term=kinematics+word+problems+worksheet
    • https://bumopajuri.weebly.com/uploads/1/3/0/9/130969054/xituzibufi.pdf
    • https://cdn-cms.f-static.net/uploads/4452372/normal_600d8c43ef943.pdf
    • https://cdn-cms.f-static.net/uploads/4472494/normal_601602161d566.pdf
    • http://kaboliwup.mypressonline.com/chacun_sa_route_partition.pdf
    • https://zipenuwoku.weebly.com/uploads/1/3/1/0/131071258/32e1c0d.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/520280.pdf
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/5295117.pdf
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/2657258.pdf
    • https://static.s123-cdn-static.com/uploads/4393020/normal_5fcd6473703e0.pdf
    • https://cdn-cms.f-static.net/uploads/4501962/normal_600fa00058264.pdf
    • http://fonudesuwobulud.mygamesonline.org/walter_benjamin_illuminations.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_d1ab2f3de8c041e5a1758e8c5c78a582.pdf?index=true
    • https://s3.amazonaws.com/sigobija/typography_terms_and_vocabulary_crossword_answers.pdf
    • https://s3.amazonaws.com/desenaz/adding_integers_with_opposite_signs_worksheet.pdf
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_41a51fa23f7e44069f551774a17d45e2.pdf?index=true
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_b2f6c6a6ddef4c738d65a859ea44372f.pdf?index=true
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_65ff44ce29a440508bcd5d4db8d4f8b3.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_d6d66a5b9ff74420a0ec292c77c553de.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_ffc8f757459e4efc90195318d3ac7a07.pdf?index=true
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_a140810bfd99481cac81f2519b9e0e8f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e5.bin
8d7fdc3c1d642d5faa9e0bb3645eea5cb09c23ee8f34810c35f0a1b6f80db8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 5580 bytes
font_01_sfnt_off0000f7b1.bin
21bd8ed8142de9f56bfae674b4afb4dd2aa05153398af459aefde88738000a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10796 bytes

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