Malicious PDF — malware analysis report

Static analysis result for SHA-256 9376ffcf255f9d93…

MALICIOUS

PDF

75.6 KB Created: 2020-12-07 13:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abd69330194c2e8e7a0df87010a00cc5 SHA-1: 95d6bc348d44c260ff2e8aa24a860d4fc4a42003 SHA-256: 9376ffcf255f9d937839acf2e12e454e6cdc74df10fff6b85c085aca2fd7cf57
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a common tactic for SEO manipulation or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=p0171+and+p0174+code
    • https://static.s123-cdn-static.com/uploads/4490722/normal_5fc3ec1504941.pdf
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/bc8cafcd3f7c78.pdf
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/574cffcc772.pdf
    • https://palokeligiz.weebly.com/uploads/1/3/4/4/134496709/5137455.pdf
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/togubedaxotikumerak.pdf
    • https://cdn-cms.f-static.net/uploads/4479932/normal_5fb770b52b0c8.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_5f9196a927f19.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fc184543f77f.pdf
    • https://musagitunoton.weebly.com/uploads/1/3/4/3/134368320/7466834.pdf
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5f91ee08ba9c7.pdf
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5faa4ada1217f.pdf
    • https://lijasefevofik.weebly.com/uploads/1/3/4/8/134889997/488047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d3a3c60-68da-42f1-b229-8dfaa3f6c5b4/naruto_shippuden_opening_12_full_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/5767a5e1-90bb-4724-8cb4-ba7a2fd66f5c/journal_of_american_indian_education.pdf
    • https://s3.amazonaws.com/gurowozenupifi/food_handlers_permit_questions_answers.pdf
    • https://s3.amazonaws.com/wixatax/deep_blue_sea_2_trailer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec23.bin
498ac1438a316fbaaf231c568c7de027763562eb8184bfaac9732a5a8c9d4074
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5124 bytes
font_01_sfnt_off0000fdbb.bin
36f75a796577761291291ce912e61e05ba48c198663b873bfa5d78e799b0635e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 10720 bytes