Malicious PDF — malware analysis report

Static analysis result for SHA-256 641c819a0d7d5d7d…

MALICIOUS

PDF

74.2 KB Created: 2020-12-01 08:36:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e9bc60a3e833e7ecc7a3edff3f2c865d SHA-1: 124c5525a6bb3b4f2347bd2aec5c595235df5f9e SHA-256: 641c819a0d7d5d7de5cc6bda537e3f72be615b5ba9f16c260f50a0daf267bdbc
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=chromecast+for+mac+laptop PDF link annotation
    • https://dilarutobafe.weebly.com/uploads/1/3/4/4/134456037/e103f8e09217c.pdfIn PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/8031913.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/4748821.pdfIn PDF document text
    • https://wogivanozo.weebly.com/uploads/1/3/4/5/134586267/3483255.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/5797277.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/c4ab7399f534.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/3373854.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/gazalofigoz.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/1ad5a44b-3de5-43da-bfef-845f202597bd/xowewurin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b3366b-c65a-4817-8647-8645a18380a9/92202356762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfc978f-4956-4953-8de7-6fcdd9b9b743/dikoroguvafuridesutinu.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/molecular_geometry_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa29f630-1829-4e93-b75f-29e9c55bf7b4/32104801872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7bdfa2-3744-4c4a-83e5-77d4c091c28b/51005580212.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 5160 bytes
SHA-256: bf7c1318c3b1bbfce16d74bb834255334a225052106dc7b18259eee884000a32
font_01_sfnt_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 10696 bytes
SHA-256: 00f96c471f9afc5f4f743020ec5ea9f1ba3c482c81a101d76ce7e1e4c767102e
font_02_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 16080 bytes
SHA-256: f4a8d95942adf9238caade498e92d91c08bc744c9f37873277fa6766f2767ae5

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