Malicious PDF — malware analysis report

Static analysis result for SHA-256 a526443383b9c843…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 18:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a13c8bc2cfc79498d736a9b1a25af631 SHA-1: 589eac0b2557f8fec9c80a6896252c5225743f62 SHA-256: a526443383b9c84324474627329ad25dc092af30eaa45530e0cac4f0b454c3f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to SEO-related content and a specific URL related to 'shipt interview questions'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to drive traffic to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=shipt+interview+questions+and+answers+reddit
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fcb25633b859.pdf
    • https://cdn.sqhk.co/numisezopo/ihdGvif/21302903733.pdf
    • https://cdn.sqhk.co/lerapuraroke/fK3gitv/guxipobadogazakuwux.pdf
    • https://cdn-cms.f-static.net/uploads/4482631/normal_600f6c2ddf586.pdf
    • https://cdn.sqhk.co/zumiredosuwi/Jjjihja/vanexisadogukozabubajikeg.pdf
    • https://cdn-cms.f-static.net/uploads/4365613/normal_60202d99b3c17.pdf
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5fdd388573554.pdf
    • https://cdn.sqhk.co/dujagazatad/gf8CJhL/nufawogijubawererekaku.pdf
    • https://cdn.sqhk.co/nowonipewo/gfVihoL/pibakapebugawejodutuburij.pdf
    • https://cdn.sqhk.co/baxafapunubi/OEKWPgj/62494711698.pdf
    • https://cdn.sqhk.co/giwibilawa/hfBrRge/40733610332.pdf
    • https://cdn.sqhk.co/ganuniwiku/jjcs5ge/knights_creed_dragon_age_inquisition.pdf
    • https://cdn-cms.f-static.net/uploads/4418746/normal_603c160b68dd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_ba5ad0e9c8994a6e8db84fbeda03563f.pdf?index=true
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_1e00301d6fcf42f89d2b79829bb252a0.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_e785dc35a75a40159e27699331068b2b.pdf?index=true
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_8d4f4e192fe34819a5554ca526425319.pdf?index=true
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_be63bc28c02f4195b980ac6feb13138a.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_35bf73e32cbb47bea7dcd01983733b85.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_8c4edb10285d4a26925782b5a7715a3f.pdf?index=true
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_50877be683fd4d8388c128a08c31f5b4.pdf?index=true
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_52b70bd87e884092ba07cd81b5070577.pdf?index=true
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_5523046322c94f41842898d6c31a1c17.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_off0000f0bc.bin
d55c800cc91fa7902cda71f7cd0eddd2950001c51138a423fd647e593f960b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 5396 bytes
font_01_sfnt_off0001031d.bin
134fd27d770a6634f3e8928bcbf26db2879c20fbe297cfeb6a434848cf9d400d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 10992 bytes

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