Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c54e02187893a0…

MALICIOUS

PDF

77.5 KB Created: 2021-03-03 10:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4f13656a64334fb25ae71e029427a15a SHA-1: afbefe77afe2095a782ab4b75f5278d03ecd1686 SHA-256: 41c54e02187893a046fbdaeb47fc277100a9ac9a65f4f84950229cc0331d7ad6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to `https://midufefew.ru/strik?utm_term=business+communication+skills+course+london`, suggesting a phishing or malware distribution lure. The presence of a PDF link farm heuristic further supports the malicious nature of the document.

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://midufefew.ru/strik?utm_term=business+communication+skills+course+london PDF link annotation
    • https://cdn.sqhk.co/jejekije/sHibjj9/free_joy_cross_stitch_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/hzwhjoI/7234150645.pdfIn PDF document text
    • https://lulipelewofepo.weebly.com/uploads/1/3/0/8/130873877/loduselijapiduz.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/mifonozuxuvel_sizafak_vixavejubo.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/007c619c5b7.pdfIn PDF document text
    • https://manujemupofux.weebly.com/uploads/1/3/0/7/130738512/ced2709b.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/jiwuvajupasef.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/b469111dfaee6e.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/davidabodigewo.pdfIn PDF document text
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/17acc988220.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/d70abded59635f.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/TPLuiaW/zefejixolixozubove.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/hiigejf/66764953277.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/c5fc3ee982d.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/wozoxub/44831756419.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/europa_report_netflix_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/abu_dhabi_sports_tv_guide_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/muxoboxebomino.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/satazixifa.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_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 5200 bytes
SHA-256: bad4cb2b83edfea2808973cb0889378624e67e472a2622edfafe11fb683ce407
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10512 bytes
SHA-256: 762d58ac734d3b3dfdc537ed02e9c336c05ea39a4c74e3768712e8ccc9cf23bd

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