Malicious PDF — malware analysis report

Static analysis result for SHA-256 902b999a18100518…

MALICIOUS

PDF

68.6 KB Created: 2021-01-10 19:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: efd8f213850d91e5a838dd5de50824ce SHA-1: d4d4d3c63752714d01fd8cf236ebbf942d662f62 SHA-256: 902b999a1810051850b15493e0c286376e025ce6dc9b15fcd341e9e377291ba8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or content distribution network for malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'geometry semester 1 final exam answer key', which serves as a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=geometry+semester+1+final+exam+answer+key+multiple+choice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5ff90c4a3063d.pdfIn PDF document text
    • https://site-1171887.mozfiles.com/files/1171887/ice_cream_maker_for_kitchenaid_pro_600.pdfIn PDF document text
    • https://site-1174404.mozfiles.com/files/1174404/nostalgia_retro_12-_cup_coffee_maker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fddfb391a9ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403674/normal_5ff406d6192b4.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/dc7e4bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5fd2d09a5dc02.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/ea145b7c394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5ff0409441a0f.pdfIn PDF document text
    • https://site-1190639.mozfiles.com/files/1190639/zimovoxadajogovakip.pdfIn PDF document text
    • https://site-1171107.mozfiles.com/files/1171107/95005505412.pdfIn PDF document text
    • https://site-1175937.mozfiles.com/files/1175937/ninagitasoso.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://s3.amazonaws.com/fojaxexino/19604315399.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 5544 bytes
SHA-256: 4f638b200bd6cffe7159bf74504383868b0f720cebb49c2f325663a6eb4cf0ca
font_01_sfnt_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 9952 bytes
SHA-256: 2bf928904b1ab02d599fc462c2a715362f747a20b04f75de9c5bf1987811e825
font_02_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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