Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfde6b6afeb22ad…

MALICIOUS

PDF

77.7 KB Created: 2020-12-23 02:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1d823046063c9852b6b0f66b1fb949a7 SHA-1: f936027c1e280f64ef3302ddca2db46c349dd825 SHA-256: 3bfde6b6afeb22ad3b18558936f63d5fe1b2be05df5111a92402c98ea04cee68
252 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, routes users through malicious redirector infrastructure 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/aws?utm_term=autodiagnostika+vag-+com+free In PDF document text
    • https://rugeponejap.weebly.com/uploads/1/3/4/4/134487210/suzesu.pdfIn PDF document text
    • https://kidodekorabatet.weebly.com/uploads/1/3/4/3/134320193/03416.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/6120144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_5fbca83f5f418.pdfIn PDF document text
    • https://xosovixa.weebly.com/uploads/1/3/4/3/134318585/dudololabaxubifo.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/kuwilax-dabowexowuxeze-davefojizokiwip-gadoxuvanep.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/b8802a38-12d4-40b0-a341-d6f1f772ea53/be_thou_my_vision_key_of_c_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/razenuporisokotijogimiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa589428-2746-41c3-8a18-06418482e319/63565053804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4d8f49-c34d-4ed1-be1b-b970701795bf/4_year_anniversary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c6fd57-e9d0-459d-a446-5eb08efadd73/50162707308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc9b773-53f4-4ceb-b368-f99bce501f27/34397114186.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c75ce2fce462bcad5d60/t/5fc666f1bc819f1cf4b3b787/1606838001834/26308482199.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2b2255b18a2b82c09c96/t/5fdd2ea1463d3b6c6f17be36/1608330915180/64206760299.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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 5452 bytes
SHA-256: 60c93a5d90990e2d921606ac209b31704ce4af36ba079957d5e7c7a543aafaa9
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10804 bytes
SHA-256: d4a7f416170e0b92a841af08a7e4290d70fc48af04f5be61e91f4dfb9750ee5f

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