Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41bd12bb16fe54e…

MALICIOUS

PDF

83.7 KB Created: 2021-04-05 01:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 696d8912001d1ba906f8384b6c3edf9b SHA-1: d8e92a65a596063f12e919e38cb3a04ee2ac51ee SHA-256: a41bd12bb16fe54ef404600b3bf7a0115485a15b1f0bc06f81594ec442f4d080
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or content-loading mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/wix?keyword=erectile+dysfunction+protocol+free+pdf+download
    • http://vipadobotisituz.mygamesonline.org/is_it_worth_getting_a_six_sigma_green_belt.pdf
    • https://wozagasogudizi.weebly.com/uploads/1/3/2/6/132682295/2ec958a703ad52f.pdf
    • http://xolozotaw.iblogger.org/61789502628.pdf
    • http://fepaporipevari.mypressonline.com/67107003186.pdf
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/0b21b8b21.pdf
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/c47504e386d6.pdf
    • http://nitafibejuze.mygamesonline.org/thinkorswim_paper_trading_extended_hours.pdf
    • http://sopisafexuj.sportsontheweb.net/lumbar_facet_joint_exercises.pdf
    • http://lezobul.medianewsonline.com/lirik_bacaan_yasin_dan_tahlil_lengkap.pdf
    • http://tadurarawi.mypressonline.com/73462242986.pdf
    • http://jiteruruw.sportsontheweb.net/73793394803.pdf
    • http://dotixomovi.sportsontheweb.net/50875661062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_57d08d866dd54ce0a9d9291bfbf3239f.pdf?index=true
    • http://nakeviw.myartsonline.com/jeu_de_carte_a_deux_joueurs_facile.pdf
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_2449e54787e347b09f544fe3a14159e0.pdf?index=true
    • https://s3.amazonaws.com/zumezeviwakiz/braun_thermoscan_3_ear_thermometer_instructions.pdf
    • https://s3.amazonaws.com/vajefam/cancer_de_prostata_diagnostico_diferencial.pdf
    • http://wusekugu.rf.gd/albatross_2011_movie.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_off00010ad8.bin
c623755909c4625df99d83b485eeba93428197a928c85e08f532b2be1959c722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 5300 bytes
font_01_sfnt_off00011d0c.bin
1e6e6a7a3e12e0c27771702c6840616a7772fe6266d95e30dbd2ff781b6a0d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 10196 bytes

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