Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9c80275b012abc…

MALICIOUS

PDF

85.7 KB Created: 2021-03-30 19:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e665230c4e39291f69687f78de533758 SHA-1: c258e1e0d15b716be9486e191ad89c17af19ca16 SHA-256: de9c80275b012abc84f989f115a5fc429d1b564314921f91f2385abbe982cf99
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is associated with a disposable hosting service. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest potential for embedded malicious content or redirection to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=bottle+rocket+designs+2+liter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ffe87df9fe3c.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/21129471612dbrgj.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/pofojunesefudubesu.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/3hfbfAf/funipa.pdfIn PDF document text
    • http://ukrinsure.com/ubiquiti_nanostation_loco_m2_repeaterdzpt8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_6051eb6abf172.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/4949523395.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/SgijcFR/90174000425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fe7f7a5aa709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5fcb0f09eedd6.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/mijc89J/best_baking_recipes_with_apples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_5fd76dad16df9.pdfIn PDF document text
    • http://maddot.space/86158920862n2vby.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
    • http://zutaturusix.myartsonline.com/gender_trouble_judith_butler_summary.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/deduxugadob.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/what_is_the_concept_of_career_development.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/bhagavad_gita_chapter_16_verse_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9208b14c-b347-428a-993c-af2dff236676/fosezanof.pdfIn PDF document text
    • http://girofili.myartsonline.com/bakaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/suluwesamivezagupep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d9c093-b599-4c3d-87cf-445263a5a0ba/dd_character_record_sheet_3.5.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/31064834674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20067a33-c453-4a70-bd10-3e202e83d43b/html_and_css_edx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe8282c-856e-4a54-be60-c7a52591b149/dd_adventurers_league_character_sheet_spells.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_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 4932 bytes
SHA-256: cd4680fb1e22f28dc4ec15a6f183fb0b55b4721e6e5fefef1855540ebd14903d
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 11100 bytes
SHA-256: b47f5a1b8d551e39fd1cb5e6709117577d0f102132eb9844cb83d6468b68b615
font_02_sfnt_off00013963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13963 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c