Malicious PDF — malware analysis report

Static analysis result for SHA-256 4088b98bc934551c…

MALICIOUS

PDF

72.8 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: ff5657922b3c2cf5d0c102aa72b2c9a3 SHA-1: 4bdae439ff65706e88133d5cf4d65cb49e081c3b SHA-256: 4088b98bc934551c851bdf1754d12cefd7640cde4ba350b40d8f3a91bda348f3
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://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://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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 5260 bytes
SHA-256: 97790ca4380615e47db26220535d095645e64d569a9b8af83a2d784eded02c80
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10888 bytes
SHA-256: 91c87fcee61dba2a62d5136c82b8395357bbc89b9fdd6b81ceee712d0de1d5ff

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