Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e512c305b8c9806…

MALICIOUS

PDF

74.3 KB Created: 2021-06-01 13:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4e19b6fae98c452f055c738992a17a1d SHA-1: 53acb0932cc763caa192d6187c98a5f86a89d0d8 SHA-256: 6e512c305b8c98061a74396f4990a38a0d141ed62f23adcc59acebc5a27ab498
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a link farm with numerous external URLs, including one that appears to be a lure related to heater reviews. The presence of a link farm on disposable hosting suggests an attempt to distribute malicious content or conduct phishing operations.

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://allytemp.ru/pbw?utm_term=is+duraflame+a+good+heater PDF link annotation
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/rumowitulitap-zeposorej-pimat.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/lifuzuzusutinumuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_5fe76f46a6869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_603bc69f75eec.pdfIn PDF document text
    • https://lajoreruxox.weebly.com/uploads/1/3/4/5/134588124/8159680.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/murafazetumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_5fd27edd0333d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_600d39c04a59a.pdfIn PDF document text
    • https://menedufigejit.weebly.com/uploads/1/3/1/4/131482930/kuridijumogigiripin.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/lamuva.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/c59ed40b-ee93-47f8-8753-a59c711a8fb7/bardon_practice_of_magical_evocation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bb9cd1-eb0b-4408-88c6-c6c7e7268af0/27804663471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a807d93-8b0c-4b16-bfd1-e36980d62a91/washington_dc_travel_restrictions_thanksgiving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dddee83-11da-48f1-848c-de62a737a229/how_great_thou_art_piano_sheet_music_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d981a2-ebf2-4adb-a0b5-d1142199c82b/vovipuzoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf1e382-99ea-4fed-a8fb-304bad1f5f0e/jepoboburiwifelipu.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 5256 bytes
SHA-256: 4b4dee8acb898e68a5585aee4a9d96c262b7dfbe70055b3b7c5be6440d35f624
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10956 bytes
SHA-256: 30291c6b0083dea6ded71cab1c22b5b6ec1bd3bfb5bfd8e863096e45d5464019

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