Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40de7a3066a6791…

MALICIOUS

PDF

74.6 KB Created: 2021-06-03 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7549c3bb40b7d3b0e9b0cd1742876195 SHA-1: b136571069c90d4cdbdc7bba2ffaa89f0012b90b SHA-256: a40de7a3066a679145aa6df066f0d84c174f87dfa1d2373310281cc96469a209
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links, some of which are on disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URL `https://jacksth.ru/123?utm_term=duet+display+apk+free` suggests a potential lure related to software downloads or information, which is common in phishing campaigns.

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://jacksth.ru/123?utm_term=duet+display+apk+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fe54ff210e19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60337a1dcfa37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6025f0e155701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_60143ac0807c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_601082cbd1ee5.pdfIn PDF document text
    • https://waxitajoxozaner.weebly.com/uploads/1/3/4/4/134474673/3672189.pdfIn PDF document text
    • https://jolifovinezaxa.weebly.com/uploads/1/3/7/5/137518016/tuwis.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/f792bb7b-545d-4d2d-8517-865cdff8d4b0/what_are_phrasal_verbs_and_examples.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144533892/how_many_questions_on_cdl_passenger_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2c0ac3-9e34-4f15-9ead-c548036aabb8/63579155201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8eb4f2-40be-4235-b660-fa3253d804ed/mebininusurum.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144423747/roropafifawokubawowoxi.pdfIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/144495453/how_many_spider_man_noir_comics_are_there.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/conditional_type_0_1_2_exercises_with_answers.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144506274/alternate_corresponding_angles_worksheet.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_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5200 bytes
SHA-256: 2aa313ef08a60dbeb5f0b9c44921f3abf2cedecdf850190eb8428efb1707c8d0
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10900 bytes
SHA-256: f13a9fe8feb34abfc0139b3f48623ca5c1c9433a332dca82e3b63ab4c34f02f2

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