Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb007392fe04fb8e…

MALICIOUS

PDF

75.5 KB Created: 2021-04-15 08:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b1459801c516ff3222656d4432973f81 SHA-1: 79d11dc6a012c5904e700c5a69fd4fb7e894dd85 SHA-256: fb007392fe04fb8ecbca902e9510c30d7fc1633dc1a24055f1f8036162748add
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external URIs, with several pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=what+means+baptism+of+fire PDF link annotation
    • http://fukoxonezadanom.22web.org/sony_blu_ray_player_bdp_s3700_manual.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/champions_league_calendario_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6020524325a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5fe77dfc1fc21.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/2jwjjjb/adventure_quest_ice_cream_crusader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_602075e73f121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_600b37f0759ed.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/who_teaches_potions_at_hogwarts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5ffeccf721f74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5ffdf5db14275.pdfIn PDF document text
    • http://kaforij.22web.org/pair_of_words_with_urdu_meaning_in.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/rilugoromarip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6056b59adee07.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/changeling_the_lost_character_sheet.pdfIn PDF document text
    • http://naregoref.22web.org/boylestad_electronic_devices_and_circuit_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/aAiboGg/five_nights_at_memes_demonic_message.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_600d412c4ef0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xopugup/30262463774.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/amma_donga_songs_telugu_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/bpsc_64th_online_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/75705911444.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/tirotasifot.pdfIn PDF document text
    • http://lenumizisil.rf.gd/pixazujalidadipor.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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 5264 bytes
SHA-256: 92486b85fd448b4ca319d2068a9038d62b3e24adcf2529fcba65d994f226c958
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 10952 bytes
SHA-256: a6f6aa471f928db81a468305dcc6f8bbc78f90421374e06cf76ca93f6da26ccb

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