Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf071fd022c01f25…

MALICIOUS

PDF

87.0 KB Created: 2021-06-07 18:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 482ba9aea82ccdc566333a69c8f70bc0 SHA-1: b0dc92f1a9ca9faecb164c000f34c8c97475f4ab SHA-256: bf071fd022c01f25371320975fd803ecb828088e5d12c44371e14dc5e2f16990
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 0.9991

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://oniceh.ru/pbw?utm_term=143+energy+flow+in+ecosystems+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389603/normal_5ff7172ab1adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467274/normal_6052dce8971a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_6013a4f120b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_6038b3d693b9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd8659b8f931.pdfIn PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/fujajapupisaruvatuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_6018cf4c59ca6.pdfIn PDF document text
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/5433109.pdfIn PDF document text
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/9111528.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/tixarebajalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_60160bad4053f.pdfIn PDF document text
    • https://bevibobozile.weebly.com/uploads/1/3/4/7/134700853/gotubix_bufulejewekad_jifitokuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_6059ec2117d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_601aaa9c937e6.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
    • https://uploads.strikinglycdn.com/files/23465546-2780-42a6-a881-5cf9174efe86/68610986879.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144598629/sapiwukumowibolelamebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c838d1fc-e2c8-41ec-9977-6382cd420d78/what_does_keep_calm_and_carry_on_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55ef36e-1307-4de5-8640-604079976310/58637852383.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144753276/ali_kundilli_2_izle_hdfilmcehennemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e9ac18-c11b-4cd2-a5e9-966a256317fd/math_problem_key_words_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35d960f-b86c-4084-aa2e-57ce775b464d/free_math_worksheets_solving_equations_with_variables_on_both_sides.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144743220/dnb_drum_pattern_ableton.pdfIn PDF document text
    • http://lururefisu.pbworks.com/f/23868310832.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 5552 bytes
SHA-256: 2e0a3e09362f0cf1232ab8e50a9697e00f013e20a6ab0bb31bff61eb066bda33
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 10344 bytes
SHA-256: 82dac0f1081c1fdb16a7e487fdb6cc9c94f3bbac3354bfb76aef232057909eb4
font_02_sfnt_off00014017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14017 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378