Malicious PDF — malware analysis report

Static analysis result for SHA-256 e939a6c735f16570…

MALICIOUS

PDF

66.2 KB Created: 2020-12-25 18:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dbbfaf00910aeb7291dff21ff38d9aeb SHA-1: 1ee4b94da1138991ff14f630f7c4f2348443e63d SHA-256: e939a6c735f16570adb493f1347e246c68b14714c5dd2297ecc2cbf1d4e93e5f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external URLs pointing to various domains, likely to obscure the ultimate malicious destination or to spread across multiple hosting providers. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=bosch+dishwasher+manual+drain PDF link annotation
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdfIn PDF document text
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/3849392.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/7895303.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/japuvutatesid-jurizi-ropigeb.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/d8sRKja/anime_maker_app_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497695/normal_5fe1284e2d1e4.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/lunirijok.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/6201226f-1840-4ab0-be43-c2e25e7abbdb/7579143255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c344f6b9-fc9f-4184-9fa5-ef5eb5986907/redeem_code_xbox360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3602732-8897-41ba-9c6a-b37a57e6c41a/manual_j_software_acca_certified.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544249f3-187c-4a0c-bfa6-6a404e60bfb3/53451888715.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_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 5320 bytes
SHA-256: 60a9fc1efb7e62fe81f09601e16ea96afc18abbdf49d7876dce4fd8e3f7bd1fb
font_01_sfnt_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10288 bytes
SHA-256: 0ff02d38b4b0540642f250f855b2573907a5851633deb1e142ffb48b6d5b1dc4

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