Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbefc483d4af2dd…

MALICIOUS

PDF

75.7 KB Created: 2020-12-17 13:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c109c5fbc98c68c6cdce2faa6d700922 SHA-1: 128df6d43d49835ba575fdc238d688f016ad4174 SHA-256: bfbefc483d4af2ddc1640bb0839efafef7a6e05c6d8f086b7fca12e70381ab31
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=cinderella+charles+perrault+wikipedia PDF link annotation
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/kapugidipogabuji.pdfIn PDF document text
    • https://sidunaxegizu.weebly.com/uploads/1/3/0/7/130776644/basumoxitevale.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/mibosoxujefola.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/80e74289-106f-48ab-a909-813d1b277459/fozovemabu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5756a6609fd0ee7b04842/t/5fc95a97e424bd7b0e3330a8/1607031448218/41735742853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fafb26-317b-4bd7-9292-8c26c8a31361/do_psn_code_generators_work.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2af36df132613bbc92a03/t/5fd0c6008f1ddd5ccbe4922e/1607517697597/96047928875.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52a1324b06a7eb31b3c95/t/5fcca5e2c00f007ceae3ade8/1607247330967/zituwosezamujivizigodix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707bf5d5-5af1-42cc-a698-eb8fc7778336/latabujalamigodoga.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e5b8a3bf4b14aba92f9c/t/5fc2bae661e25426e1919e86/1606597350974/song_of_susannah_illustrations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29135b58-ab60-41db-b319-20ef838a9f5f/34041612604.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58976104edf1d77a08e6e/t/5fd6a57d481cfa31add27280/1607902590010/writing_algebraic_expression.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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 5220 bytes
SHA-256: a21399214f68b6cc4e1cf2abe3815379be548df1881ce2d2bd0336c58e7a7042
font_01_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 12900 bytes
SHA-256: 6a0719ddf8965fce4a098666c4901246f97ec49e7adcfcf5c1badbf251468bc5

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