Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f2cb1645ff0cd7…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 12:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6f02b56f9bf29640d0508bd3f102d02 SHA-1: 5a6c0f2d53f42661b881256eba3ad1e8df82d198 SHA-256: 08f2cb1645ff0cd7c20c38671d7c28ab92a957a84dac84711c197084b5db6cf1
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 0.9960

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://jottigo.ru/strik?utm_term=maytag+bravos+mct+washer+service+manual PDF link annotation
    • https://cdn.sqhk.co/posiraki/5Z1hiid/best_rechargeable_aa_batteries_for_outdoor_solar_lights.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fce77d920363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_6055a0d165731.pdfIn PDF document text
    • http://kmplitka.shop/time_capsule_box_with_lockj9dn2.pdfIn PDF document text
    • http://lady-bug.club/mimanexawagavonexirpiq5t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408989/normal_5ffca3806c605.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/0ifefrH/fish_eat_fish_grow_big.pdfIn PDF document text
    • http://cardioactiveuficiale.site/17589322749a291q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406208/normal_5fcd36a0ac80b.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/i1hi1B6/dikuti.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/kemeg-falosaki-sisini-dusow.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/xugiro-befodiwum.pdfIn PDF document text
    • https://bitipares.weebly.com/uploads/1/3/1/3/131379103/vadotu-seporemezorulo-werap-dedowetepomijef.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/fusesejikebofideseg.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/bzCxhiN/71159945295.pdfIn PDF document text
    • http://premial.su/how_to_make_a_paper_puppet_step_by_stepkoeg1.pdfIn PDF document text
    • https://cdn.sqhk.co/menidume/bkLigt8/free_tv_guide_nz_week.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/ev1jeji/44049302121.pdfIn PDF document text
    • https://cdn.sqhk.co/xajimujigaju/dhhcifH/86430888006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fe76a96606f6.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/javujukosim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_e02095ea42674e7e96a612bafefc3175.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_e359032a560b458ab47f8769b17ea353.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_991ae83b53e9430a8946f63b08310437.pdf?index=trueIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_1ca3b46dcc8649b3b4c9252663a2396e.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_6040940855d24baca2ffb51404be82e3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5612 bytes
SHA-256: 8fc054361039650281006802b6b8d3db9e642fd36b674d603c7a36128a428a98
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 10396 bytes
SHA-256: 4aa8cc9a9a4b5f2b1327bc40c4b66459ff84c7ad4104c17970c1ddf7043e41b6