Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fbf0e8e1c2b4f4…

MALICIOUS

PDF

67.6 KB Created: 2021-01-05 05:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 63bcdcab7247a3353f65e4327652f994 SHA-1: 0fa3e38529269a6998dc45b354f2d3cdbe6ce058 SHA-256: 72fbf0e8e1c2b4f4c182823bf00447d46cb48ed7d19614a31b0178114ee350c1
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a common tactic of using documents to funnel traffic to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?utm_term=aluminum+sheet+gauge+to+mm+conversion PDF link annotation
    • https://cdn.sqhk.co/wajidafix/xLOMKhh/30441759486.pdfIn PDF document text
    • https://difivasopiv.weebly.com/uploads/1/3/4/5/134599246/serejuso.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/fijaderewebe.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/KRjirT2/ncaa_college_football_national_championship_2021.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/jwIHghW/piano_keyboard_classes_near_me.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/fubufugopig_gasenu.pdfIn PDF document text
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/zivugiwowotil.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/iiHO83J/dj_mix_song_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/icje7ur/sport_bike_drag_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/hajghac/image_editor_change_background_free.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/wibadinavosunom/13298675515.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/10050703970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d704928c-5943-484b-8390-d718aa48c201/minecraft_fire_and_ice_mod_hippogryph.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 5260 bytes
SHA-256: 97790ca4380615e47db26220535d095645e64d569a9b8af83a2d784eded02c80