Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6028ca5299c4501…

MALICIOUS

PDF

83.4 KB Created: 2021-04-06 20:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b71639bb3fabcf1e4e46ca294c8a4335 SHA-1: 3d9e04ad308281180588903042bd3b595f47318e SHA-256: c6028ca5299c450128d32882f5a9286804da1297623a322594774eef0f61e335
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, and is flagged by multiple heuristics as a link farm and potential phishing or malware distribution vector. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to 'interview questions', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/123?utm_term=interview+questions+and+answers+for+logistics+officer PDF link annotation
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/882820c6775cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_60277c16d879f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_602c76badd34f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5fe27986477dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_605bc8f82727c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_600fb1f27c712.pdfIn PDF document text
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/xixiger_sasapepozugalu_jegavamapedo_lovefipewurop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5fdfc1b985785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_5ff7944ef2501.pdfIn PDF document text
    • https://lomagifotoji.weebly.com/uploads/1/3/0/8/130814873/guzizokelutejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_603aaa4ca7be6.pdfIn PDF document text
    • https://gejabadofezeda.weebly.com/uploads/1/3/2/6/132681436/6221078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5fc7a782b98d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_601189ea679bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_60340d423fcd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_602c064524fde.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://31f314b5-0768-4c24-bd49-4596ea953b46.filesusr.com/ugd/85a4b1_92b1c91a56ac455484e7c9d235f6366b.pdf?index=trueIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_236864da94ca4bcdadfcefc0527c6101.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_1f2ab8ab74fa4914b748a317fee67bba.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_baf5d7583d964b3fa7f31932e38ee960.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_d71d05127f5749988c486628dc2273a1.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_04265f3cf5dc47bb956b18383af47f05.pdf?index=trueIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_2fdf1eeb74694ff4b80e4a3e0e8cfe5f.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_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 5288 bytes
SHA-256: deff7bd5276cec401441ed117954a37a2bcbae41382caf1e4e4da68304b5f053
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 10708 bytes
SHA-256: 24290ac3540fa22af4a0fb60636151da9f6eadd9a08696f20b1720b8cc5d4636
font_02_sfnt_off000132f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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