Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ca43f4782d51bf…

MALICIOUS

PDF

97.1 KB Created: 2021-02-22 14:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c198f95d775bb13ee99ec0a83345ead8 SHA-1: b0e56e3b3e7910584ca9add671e34af8b0b84c52 SHA-256: 25ca43f4782d51bfeff0fcfb5336bbf00bf74fc0623ae5d6a10a5bfee88bb8b1
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-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://crophysi.ru/123?utm_term=2012+panasonic+plasma+tv+65+inch PDF link annotation
    • https://guxatizozekeme.weebly.com/uploads/1/3/4/7/134733227/2314582.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/c21d07c3f1b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_60182ec3c685c.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/fazujo/pulole.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/renumokiriroxafipivomafa.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/darilebuzisefumisozi.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/sosedozefanatatawa.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/68514801685.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/tovifem.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/ketegoru.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/kolibatikuvewezoxaxoluxol.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/bully_ps2_english_class_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/tavisimuvisa.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/android_phone_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/gottman_relationship_guides.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_off000135b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B7 5648 bytes
SHA-256: 352d35c077ae757b6618130f88f71b067516f10f0b7b377dcba11f9430773467
font_01_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 14672 bytes
SHA-256: a89a032d343185057a15d380aa8f8430c54b31779e218ff7c99cfa143f6e6f88

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