Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b9a6ebc0a528a4…

MALICIOUS

PDF

84.1 KB Created: 2021-04-19 12:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b2ada1d4990b14f968748cef9109b957 SHA-1: 7bed39d2cba431403096bc5081860ef97e3b23bd SHA-256: 79b9a6ebc0a528a4f6c2dbfdced2a91b44fbef06171a18a8186b704b32c6d06e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or SEO spam campaign. The embedded document body text is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/strik?utm_term=life+in+uk+book+2021 PDF link annotation
    • https://cdn.sqhk.co/numavagoko/brbc6jc/really_cheap_second_hand_clothes_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/TicjiTW/32502220949.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/7041836.pdfIn PDF document text
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/1ae8407d.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/162d365d.pdfIn PDF document text
    • https://cdn.sqhk.co/wodegamido/fiihdqs/kwanzan_cherry_tree_information.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/ljhGD8p/bijelujanix.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/what_is_simulation_and_simulacra.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/bdffa4afc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5fec4fa1e733b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452621/normal_60070ffb88135.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/star_trek_into_darkness_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_6067e2c08b0a4.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://gomugugagaf.onlinewebshop.net/65616895189.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/26868128777.pdfIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_594881e97a214719b49ef9f3d4047d31.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_df899a1f823849c7811f559f11179e1b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 4520 bytes
SHA-256: 4489874167de2a78090b5a931832e46ce200e37fb269365e22bb4094dd86c160
font_01_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 11036 bytes
SHA-256: ee29ba5ea772c7acea7e259b8216e1ed1a0b8f6145651710e841607a5183ee32
font_02_sfnt_off00013599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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