Malicious PDF — malware analysis report

Static analysis result for SHA-256 3562ffda4f17e826…

MALICIOUS

PDF

64.1 KB Created: 2020-11-19 05:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 615336bac9f4f7fe03d1233e5dc9934d SHA-1: d78de3ba58313c4b3b589ca940bfd3ed0c770ea0 SHA-256: 3562ffda4f17e82685183a45e843f95b027fb835cd6bb74b6855b7aa9283152a
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 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=relational+database+design+clearly+explained+pdf PDF link annotation
    • https://nifufoji.weebly.com/uploads/1/3/4/4/134458522/wutomataguvuwasiw.pdfIn PDF document text
    • https://xazujojupise.weebly.com/uploads/1/3/4/4/134493550/denunefakuram-wifavoxez-gakamuxudijig.pdfIn PDF document text
    • https://kifisiwa.weebly.com/uploads/1/3/4/2/134266158/zanaxurozekumimifawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f88984e9c643.pdfIn PDF document text
    • https://berotejenikakoz.weebly.com/uploads/1/3/0/7/130775756/9b7eeb7d02dd14d.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/pikiwosug_subizix.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/bataza-nonevukabun-salazewuxagi.pdfIn PDF document text
    • https://nulosomeka.weebly.com/uploads/1/3/4/6/134605351/ximomosoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e3343696-4342-438e-8597-dce3aaf0e2fc/how_to_recover_gold_from_scrap_computer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/kofimuxemuvarok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2806965e-f826-4582-901c-e37a2a33d432/jawujanevusajidiwunutofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a521a88-dab9-4547-a60e-bf8b008f3926/daxapodupapovadasobun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a0fc72-9d27-4ec5-8cfb-0fc4f3631b37/rvolution_cubaine_rsum.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/zaraxusamokimipiloxar.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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 5428 bytes
SHA-256: 91bf97b6dfdb7c6bf48d30420ba54f7bbbf11889e08bf70bdb414007a46305ad
font_01_sfnt_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 9748 bytes
SHA-256: 98cbe5a6b5481a0b88bd24533c2a30648f5c0c2fe8e933d7f29fcb3e47972342
font_02_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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