Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7686234392cde56…

MALICIOUS

PDF

68.5 KB Created: 2020-12-22 02:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fd55da17aa86586ccdd5c0c5947fdf7a SHA-1: 96a61b00e5fca06d5db66af19177eb8ad41192e2 SHA-256: f7686234392cde569086ef62d9a2e00bb263b11c6a62644d5a6849f7bcf3efc3
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://trafffe.ru/strik?utm_term=arctic+wolf+habitat+planet+zoo PDF link annotation
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/sulalulixewimit.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/3071210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe045a3f75b166439bdc75/1606288477076/homedics_cool_mist_ultrasonic_humidifier_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6009caf-8ae5-429e-879c-b2a92507672d/88380673342.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/robakerolagezekezonin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe4ef7b-65d0-414c-a9fd-d97003e75024/88540801895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6ae58f-e5ac-4545-874d-3d3b0220343b/16232346460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9cd95b1-6634-4f27-b9bc-436bd1e01e90/.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/dua_ahad_nama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b18e42-5d4d-47ea-bf74-eed996362775/90695032901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766ec0ad-3223-4e26-83d6-b5450e2e9fe0/kufomugolusidatinopipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762cf8a1-4e45-4a27-a5d9-aed176df4ce8/fa_step_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c424a5-dbd5-4ec6-af0d-bbe6f18a7f84/50490951003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc747d2-f0a8-4aaa-913e-3eb920e98591/64318269983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a901bd84-a8f5-48a9-a3c2-ec46a2ea05f9/pudutan.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eb35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB35 17404 bytes
SHA-256: 770797e666332664248dbbeaaefcd7775d49fef7084549691dcbdd35baedb4d4
font_00_sfnt_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 5196 bytes
SHA-256: 71e6d23dd6d146ffe63693a78d96827229e547b04a26a8a22914039c174ecdf7
font_01_sfnt_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 10784 bytes
SHA-256: d8e144c931e35418a0dedf33cc63d99e04cd42039453805441ca5e3a049674e8

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