Malicious PDF — malware analysis report

Static analysis result for SHA-256 33facf8bdbbed62d…

MALICIOUS

PDF

77.3 KB Created: 2021-05-12 12:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c7c5599a8a06eeb25ce1f4adc0e0bd7 SHA-1: ecaf8e8ed5de9554dad26a5e9673541a72bffa42 SHA-256: 33facf8bdbbed62d43b94442f80ba1bd88f7730086ddc67d81ec8cb411e47079
156 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a site related to setting up a mortgage account, a common lure for phishing or financial scams. The PDF also contains a large number of external links, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=how+to+set+up+wells+fargo+mortgage+account+online
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd66dc472e82.pdf
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5fc7602c26021.pdf
    • https://cdn-cms.f-static.net/uploads/4376103/normal_605a712138444.pdf
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/zulexoj.pdf
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/9460930.pdf
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/nebuteg.pdf
    • http://fsbsiod.com/66002205959bma27.pdf
    • http://prod-fruit.space/practice_cursive_writing_worksheetslsbte.pdf
    • https://najoxoveg.weebly.com/uploads/1/3/4/6/134677255/30b31313ce4.pdf
    • https://cdn-cms.f-static.net/uploads/4477886/normal_603e856301dd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_dc94e10a6da742a0a3000c83edd85de4.pdf?index=true
    • https://s3.amazonaws.com/sajezife/how_to_refill_hp_62_black_ink_cartridge.pdf
    • https://s3.amazonaws.com/serogajugomiji/zolobonixazovom.pdf
    • https://s3.amazonaws.com/litunux/boss_me_25_user_manual.pdf
    • https://s3.amazonaws.com/janodojivi/fotasovebuganeguzirekapiz.pdf
    • https://s3.amazonaws.com/bezutu/74254711691.pdf
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_74bf6b0aaf1443f1a92870890a49f1cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1b6bc389-da4d-426c-afd7-3e673148375f/16914213326.pdf
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_b07a09ee22d94ed7b1686e915e946e62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82e2e851-55b1-4547-9051-ef86d20c5f25/61414437937.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_51438b04ea0c48d89f305fbdfa694e90.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4f.bin
c61fbbd88ddc72937b61c07b289d444154869683c58c3625502df19d3f350948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 5388 bytes
font_01_sfnt_off000101a5.bin
bb7560f1e98e401e3c1e4e870796fa6ec127fdd8822f709ae965db86cfe46f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 11212 bytes

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