Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5f21e5cdf5a588…

MALICIOUS

PDF

75.3 KB Created: 2021-02-18 14:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b67ea8ab0fb3ccfd80354f5cc21cbf56 SHA-1: 8a7117c1d6516d66ccf2ad7011cce19b382727fc SHA-256: bb5f21e5cdf5a588adc69cc78f38b5331a8c149dbcdf19bd99e408dd626113c6
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to writing restaurant reviews, which is likely a pretext to drive users to malicious links. The presence of external URIs and the 'link farm' heuristic indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/aws?utm_term=how+to+write+a+positive+restaurant+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5fdc2e14ce779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5fffb12658d1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478952/normal_5fcdc3051a1e0.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/ge0zdha/lowinodod.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/hIMT2b0/66333172814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5ff767c13e7cf.pdfIn PDF document text
    • http://betixisu.22web.org/92620172761.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/jccwhdV/chennai_super_kings_players_price_in_ipl_2020.pdfIn PDF document text
    • http://jaxebememapi.iblogger.org/69023947180.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/deadwood_the_movie_parental_guide.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/vumubebitorexavov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevidubigozexa.rf.gd/rocksteady_mantle_guide.pdfIn PDF document text
    • http://tukorokibenej.epizy.com/xitim.pdfIn PDF document text
    • http://tororixiranop.rf.gd/11016543262.pdfIn PDF document text
    • http://doxinaxa.epizy.com/ingenuity_convertme_swing-2-seat_instruction_manual.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/kopasad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 4896 bytes
SHA-256: 1e6c82f683b67e15c8acdba0c38d9a852eb6ac32f0c18be0109ae54c677d8da6
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 10392 bytes
SHA-256: df4bc83c732449e7995ef72a9f9bad6ff1ef2a3be93c1311a354fdab4977a3f5

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