Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0833912d35add1c…

MALICIOUS

PDF

118.0 KB Created: 2020-11-13 12:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 43b825bf05a54c0e764488935c7b7625 SHA-1: 98507c3356c77baf58fa5192771cb7540f6d611d SHA-256: e0833912d35add1c64e3e2ac6b01d9e34286a14916cdbae75c65576bb35607fb
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://traffnew.ru/123?utm_term=jura+cleaning+tablets+substitute PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5f9ea7968490b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_5faaacb77247b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_5fae1e3805c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5fae3cc2d513f.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/natisi.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/podijudikufidasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_5f9d7e1dac1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5fa5e2a3a0293.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/a7a7829b-b00f-4eb7-bba4-e6000e6b23a5/wuropazegedodelazebijeno.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/developing_an_effective_administrative_procedures_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/como_bloquear_paginas_web_en_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7fe845-b093-469d-a0d2-189b04e0e404/56085686408.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/the_black_swordsman_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/nosokijorosesajojofegip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A3 5096 bytes
SHA-256: d92c3177ea35782ebe03c3eac814861d2562c90c8f33f6ef4815d6e92d6ea465
font_01_sfnt_off000194f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F8 1796 bytes
SHA-256: dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c
font_02_sfnt_off00019d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D82 13460 bytes
SHA-256: a2afe871dac328d573b49c2eb97f96adb96dd7765c106c9417d6f622f11eccf6

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