Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaf8ab713585393…

MALICIOUS

PDF

134.4 KB Created: 2021-06-01 07:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 33f18d9110c6dba69d5206384c9932ae SHA-1: 2b71da70c296f04bb0be78035c0d0baa514273dd SHA-256: 5aaf8ab7135853930a58ec0aadb454b5bd79d422c10ecd0dee7c43d11ae7b6f5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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
  • 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://bologen.ru/123?utm_term=herman+bavinck+the+doctrine+of+god+pdf PDF link annotation
    • https://gegaminowudajun.weebly.com/uploads/1/3/4/0/134041134/buwodege-dodubujokibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_606e404a9262f.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/4955f94659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_60635c076b933.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/9581923.pdfIn PDF document text
    • https://gajubunumokava.weebly.com/uploads/1/3/4/3/134341855/tuzunuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_603d2d3b13cb3.pdfIn PDF document text
    • https://xedutorapul.weebly.com/uploads/1/3/0/8/130813372/vijozuxot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5fee84ff93c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469824/normal_6024fc666c68a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_604ce2105f33c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_60192c8fd2da1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4456391/normal_60b554164c0df.pdfIn PDF document text
    • https://rikolalevagamer.weebly.com/uploads/1/3/1/1/131164452/zewejiju-vezofanotibone-wikoloto.pdfIn PDF document text
    • https://simovisebosa.weebly.com/uploads/1/3/4/6/134649932/01517ea.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4474456/normal_60b11663aa9ba.pdfIn PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/7678ec622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paderukut.pbworks.com/f/60532247026.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/5_reasons_why_capitalism_is_better_than_socialism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37389caf-99d7-4cfe-bd0a-5e831e3c0ea5/kenwood_ts_450s_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c678decc-2d84-4d36-a37b-c814bf547dbc/zapeborokozuxidenez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d61c5d-a2af-4991-9bff-c0591950e5be/what_are_the_duties_of_a_zambian_citizen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba25b6d-c76c-4a6a-a152-40451c914784/25635902306.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/puwerigegu.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B15 15124 bytes
SHA-256: cf1a5698fde79175a924a4bba209a4c7f2a96bdaea15c32d2d7eae937e80e2f7
font_01_sfnt_off0001ab43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB43 5584 bytes
SHA-256: 92406846232a063944ee94ccded642d8bd393e3d5ed4143b127053568ba37101
font_02_sfnt_off0001be1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE1B 15740 bytes
SHA-256: 6de510a8a88b3b69e3ba938b02f9aebb5d0741ea0cea881d717be83d9104d475
font_03_sfnt_off0001ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED64 18152 bytes
SHA-256: 0d5149f62a0dc010bf4d31d2824b570a6f05737d715c555bb0c491e1fbbb56c4