Malicious PDF — malware analysis report

Static analysis result for SHA-256 601f89ee7cab958f…

MALICIOUS

PDF

75.2 KB Created: 2021-02-06 19:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd26c9dd881d17048a42d9ba91c106ab SHA-1: 5206b9d326bfba5026553bd0f4c42eea5f5c0ca4 SHA-256: 601f89ee7cab958f65e1080a52f816c1270b1e61871c24df2fff1bae16e116b0
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://bologen.ru/aws?utm_term=dictionary+free++english+to+bangla', suggests a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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=dictionary+free++english+to+bangla PDF link annotation
    • http://grantmedica.ru/midofedutewumvls7b.pdfIn PDF document text
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/e47831f.pdfIn PDF document text
    • http://powerhdniy.space/sanexajiputi0hd5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_5fda7425d2b2f.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/tudaworukibamabu.pdfIn PDF document text
    • http://ndfnasg.xyz/zekemofekiwiqwsp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/98892120155.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/lisube.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/10381339283.pdfIn PDF document text
    • http://nanomunem.epizy.com/japiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/96496389510.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/xasilesoruwuxuranon.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/derivational_and_inflectional_morphemes_worksheets.pdfIn PDF document text
    • http://zemigubu.epizy.com/assets_android_file_path.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 5384 bytes
SHA-256: fcff386d9b029f79ff90780bf5736457899a2029f9d352a32c35df85fb035f5e
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 11252 bytes
SHA-256: b8890fc035976aca93b552cd4ebd1c1fa5e68f09bb08913045bbca8b1b4b269e

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