Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b14e638a25f64e…

MALICIOUS

PDF

74.3 KB Created: 2021-06-01 16:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1f494d7ec0dca5d7f9a5029dad06ca SHA-1: 29995c7fee618cca96a7bae13dfedbff7885bab9 SHA-256: 92b14e638a25f64e2e8d988de308fb1c29e7e20e0b677738331f85cd7864b6f4
156 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 of which are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, suggests a lure related to software registration keys.

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-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://philabc.ru/pbw?utm_term=winavi+all+in+one+converter+registration+key
    • https://cdn-cms.f-static.net/uploads/4464327/normal_60688ffe587a3.pdf
    • https://rinizazekuke.weebly.com/uploads/1/3/4/0/134012784/4f4bd3febf7fb9.pdf
    • https://cdn-cms.f-static.net/uploads/4488346/normal_606455019575b.pdf
    • https://roxasudafuj.weebly.com/uploads/1/3/0/7/130740166/kawodixefilel-sagilijezono-tugixuzasufuwel-pegudiriruba.pdf
    • https://poxozebirineba.weebly.com/uploads/1/3/4/4/134447173/2691450.pdf
    • https://static.s123-cdn-static.com/uploads/4490125/normal_6004b81819951.pdf
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/151ba42239.pdf
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/2873098.pdf
    • https://cdn-cms.f-static.net/uploads/4448126/normal_5fe693642fb8e.pdf
    • https://gapelovonexi.weebly.com/uploads/1/3/4/3/134385778/4a6ee497.pdf
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fd66a5e370fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/569016ff-3391-45dd-94a0-cf69387d6fcf/51463725621.pdf
    • https://uploads.strikinglycdn.com/files/8c6b2654-fe38-40d8-9bd9-9a4808cd50cc/oxford_nj_house_rentals.pdf
    • https://uploads.strikinglycdn.com/files/ace0ea73-5d37-4639-a78c-33690233b1f8/vezajuwuvomar.pdf
    • https://uploads.strikinglycdn.com/files/4cc6226a-672f-41ab-a9ff-3487ddc0ddd9/zuxoxogirorunivokorosopur.pdf
    • https://uploads.strikinglycdn.com/files/5b12491f-f94c-44f0-87c6-6973deaa4a7a/how_to_use_a_cen-tech_digital_multimeter_to_check_voltage.pdf
    • https://uploads.strikinglycdn.com/files/5af53760-4cb2-46f2-8c4d-d25ace72355e/rareromawato.pdf
    • https://uploads.strikinglycdn.com/files/79bb9ba9-6249-43ae-8a9d-04f95e9c8a05/sleigh_ride_flute_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/dce1487c-3e56-4a71-96a6-9c15e367811c/96665872414.pdf
    • https://uploads.strikinglycdn.com/files/be9d5ee2-629d-4c29-a819-d45cca4e9135/10457643487.pdf
    • 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_off0000e338.bin
d4eabee0f92c830d1d08578909af5449b3d625879b72d1f2b81b9b769aae53dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 5204 bytes
font_01_sfnt_off0000f517.bin
b3262473a1652237ab665af65495e00292bea85d572cc6765d36f04f640f83d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 11092 bytes

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