Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab145c365f87e1c3…

MALICIOUS

PDF

82.2 KB Created: 2021-03-12 09:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 72f82aa7abc5e818ec160bb0596a3aa1 SHA-1: d1feac1bce8e9e8dbb43a451f5bb20fcef6f5da5 SHA-256: ab145c365f87e1c317f030e8f8b7feef551a58fcf9a121732347e6e3a02f2062
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and a link farm. The embedded URLs point to domains known for hosting malicious content or acting as redirectors. While no scripts were explicitly extracted, the nature of PDF redirectors often involves embedded JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=emoji+2+word+answers In PDF document text
    • http://linorusani.iblogger.org/centralized_ac_system.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/bBmnZtS/radio_sydney_italian_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_60468cd527506.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/UgjIicD/67592849009.pdfIn PDF document text
    • https://cdn.sqhk.co/wojidumezu/2hgjfjg/feasibility_study_vs_options_appraisal.pdfIn PDF document text
    • http://raxajifiwovoj.iblogger.org/13448234102.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/heiejat/resident_evil_8_ps4_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/jgghfHG/forexolajegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_604913d18554b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385038/normal_5fe2d99761236.pdfIn PDF document text
    • http://buxozadogaro.22web.org/98347422743.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/126k8gc/fruits_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/VhcFsja/38866500754.pdfIn PDF document text
    • http://pizetagudagunox.22web.org/cardinal_numbers_exercises_for_adults.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobezoneroli.epizy.com/basalt_plateau_formation.pdfIn PDF document text
    • http://silisawis.rf.gd/10000_reasons_lyrics_matt_redman.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/mudufi.pdfIn PDF document text
    • http://nekoraxevab.rf.gd/porejif.pdfIn PDF document text
    • http://zumidid.rf.gd/bekhayali_mp4_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/28134589723.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/69109693425.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/wabugid.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 3656 bytes
SHA-256: c1a1dc64673d30859217a6f316fb12a293bd73ef1032dcba4f807416b1c3f8e2
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 5196 bytes
SHA-256: 63be967ecd567a9bc32e05ca1a0fdcec0e5daf3bfbc7a1a7e923a6c68a19d9ac
font_02_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 10540 bytes
SHA-256: 0dd0ebda3bd099ea20489bd3865621e8e73e606996b8ab71644827d25ba5b2a2

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