Malicious PDF — malware analysis report

Static analysis result for SHA-256 b785a3c7d318f7f3…

MALICIOUS

PDF

72.5 KB Created: 2020-12-29 14:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6136ef6f102d539a8b05308281c0ce7 SHA-1: 96cd0e925e2543de585a801968fee4ae7d450dde SHA-256: b785a3c7d318f7f3af2146f527b400386264f78c64dcec9871dd3fe4dcc5104d
164 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 6

  • 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.
  • 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://trafftec.ru/strik?utm_term=sector+strike+apk+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fa5de9b03353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_5fbac14252226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fc691b685106.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/jadivopo_mejek_rovogisosik_vefajogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5fa5860e5416b.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/xelipepeloves_zamekipemup_gusuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_5fd0e35815f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5fb642024ba0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5fc555ba77de1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2dbbfe-0a83-4123-8b93-572ee406f767/pathfinder_rpg_house_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/avatar_maker_apk_review.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/8924172217.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/shining_the_morning_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/bvb_college_bidar_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae673694-d444-4858-b6ab-39d1a303bb72/telugu_love_music_ringtones_free_download_mobile.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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 5356 bytes
SHA-256: c0251420c68a8fdb269f26a697ab4f0f46fb4d412bbd09dc8c3d303b0ede8dc2
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 11760 bytes
SHA-256: 84457383b04d4c585cbbf16355395aacf7379e6f8ade35b0cd8832e449c094a4

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