Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac56c4500fc2f572…

MALICIOUS

PDF

73.1 KB Created: 2021-01-04 01:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 07443f148355f65d92f04a5147fa22c5 SHA-1: 888b4b699a3d31f9926dba6271232cd088a87192 SHA-256: ac56c4500fc2f57240afd9f34391c68ae5fcca468546f7f358ac0af992c9307b
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=verizon+android+block+outgoing+caller+id PDF link annotation
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/5599736.pdfIn PDF document text
    • https://mejawazur.weebly.com/uploads/1/3/4/2/134265830/7162401.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/220039.pdfIn PDF document text
    • https://xotototovizeta.weebly.com/uploads/1/3/2/3/132303406/4d0c79145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fb88c7ae18fb.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/jenovu.pdfIn PDF document text
    • https://xukafubisek.weebly.com/uploads/1/3/4/2/134265855/c906155d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5f8bb1e7861b3.pdfIn PDF document text
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/83071ade4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupuso/bekoxusil.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/zamepavadaruxesofewalanuk.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/36779314153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a27270-6897-43ff-af90-32dac1c42bce/jenor.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/57065355969.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 5148 bytes
SHA-256: b08441f9d8ea90ccec842b13e1820b8feaf267a1c2bfcc6f0916f81de7d08103
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 10624 bytes
SHA-256: ca9688367bda8afde2fb9b13e112080dd83a9dd58961b2c6b1f18fc5f387dbb8

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