Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdc3dc2087bac4b…

MALICIOUS

PDF

69.7 KB Created: 2020-11-13 05:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8bb94d843f4aaf011a9b0a5727ea58cf SHA-1: 19c08f7b3c99417701567883d6c238a8a57d0bd8 SHA-256: 7bdc3dc2087bac4ba0e09976e6f107e96a5c4c14664ba0542290c8437cbf1c69
164 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'trafftec.ru', suggesting a phishing or download lure. The presence of embedded links and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to distribute or redirect to malicious content, likely a second-stage payload.

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/aws?utm_term=pdf+to+bibtex+converter+online PDF link annotation
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/puxape-rexamadigalamu-bivuxidena-jabaro.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/xujafoxirunugo.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/kekobimosekuwi.pdfIn PDF document text
    • https://sigodujirole.weebly.com/uploads/1/3/4/3/134319969/d519a8a12e597.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/c86a8175-1b2d-45f1-8bb9-cef1b2c059e6/barbarian_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/694ae47e-20e6-489b-9c06-67371bdc23b8/79062658407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e9b2ae-c5ff-45e6-af73-5d30c2c01efe/blaze_wizard_skill_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc879a6-ebb3-4af8-ae69-55f6318599a6/82878998370.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/la_luna_sangre_july_11_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vezosoluvezoj/nasidasafevememekufadox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd99de3-da37-48a9-9491-e9ee119da763/56433811597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bc3bac-c613-44cf-95f5-781ab0c4ba76/89498615347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c12d2d4-0ed0-4a91-bda9-889fde7f4fa7/nivenater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb4fd98-3488-44b4-877d-e457e61d4474/46964638468.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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 4896 bytes
SHA-256: 788ad52805f3f2c8c925ead93e1e196684d01251197b5ddfac8ae4e36f47f44f
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 10448 bytes
SHA-256: c48178394c8cafa440ce87bcd006804034e18c1a6be948f587e392a82cd47c01

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