Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e7fe20da58fb50…

MALICIOUS

PDF

82.0 KB Created: 2021-03-08 02:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01c7c0caa2532a623900a97c06ceab67 SHA-1: 285bc9679a4df2e055a95b4cce425e4c29631ae6 SHA-256: 43e7fe20da58fb508393124fa655e3caccb136de40c3df348719110d9b7ef125
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for hosting many links. While no scripts were explicitly extracted, the PDF structure itself is leveraged to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=the+city+and+the+pillar+quotes PDF link annotation
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/5976974.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5ff5f01735f76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497658/normal_5fcaa1d2f34ff.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/vgdidjr/infected_cuticle_finger_nhs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_6013a7cbe914f.pdfIn PDF document text
    • http://lordtrans.ru/67932889041fwnve.pdfIn PDF document text
    • http://rimelutafoterir.iblogger.org/bamedep.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ZzdYyjj/daily_challenge_card_games.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/ifjj7ge/91865445641.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/jezimuwavevo_sunune_setepege.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/ddf94c0a649a0.pdfIn PDF document text
    • http://trokot-online.xyz/dragon_age_origins_ultimate_edition_steam_modsu11mt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_601723e9b1d8d.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/nvjfjgQ/rockstar_games_launcher_en_tu_pc.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/942eca1bf.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/XDggIgf/definition_of_career_outlook_meaning.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/gavobawum/97114583641.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/vadiwopagerovavujaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/ap_ssc_10th_duplicate_memo.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/bujekujer.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/68250756349.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_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 5340 bytes
SHA-256: 8eda812f114b43b9560aa86a4bd187edfb981cac8afc08ac5eae6627fda95531
font_01_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 10840 bytes
SHA-256: 946b51e3edf545c9fff7d0a795759219d0518bc25c072dff7f4eabb6ecfa1f1c

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