Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7855bb4072a0d1f…

MALICIOUS

PDF

67.9 KB Created: 2021-03-12 20:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ee206b5f27c88e61183bfdf766b32169 SHA-1: 40a1cab51f265536e3ae7f0a3409bb61e1aec222 SHA-256: b7855bb4072a0d1f55b3790d68849f635ffe821a306684a94ecec3f1a466c31f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a strategy to obscure the final malicious destination.

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://druttle.ru/strik?utm_term=the+white+princess+full+episodes+free PDF link annotation
    • http://gvidilon.ru/fedokozifuud9sp.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/8711828.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/c16d3b41f90.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/f94bff.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/pawimis.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/13034.pdfIn PDF document text
    • http://greatholl.com/buzidizekiruninesibabez4uqy.pdfIn PDF document text
    • https://betutemibo.weebly.com/uploads/1/3/1/4/131453998/jisuwuworigelur-lanukuzusizew-jekozob-miwawopi.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/practical_aviation_security_2nd_edition.pdfIn PDF document text
    • http://dofoziteda.iblogger.org/e_aadhar_card_using_mobile_number.pdfIn PDF document text
    • http://setixin.iblogger.org/anghami_windows_7.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/906b4bca-a3ef-44d8-abfc-52c77b4a32ba/zoxurutadaxavimufog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e9b968-29c1-4de6-a5fe-606bb4ae34a3/wasorokuni.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/saretuwevogepolubegejos.pdfIn PDF document text
    • http://taditejob.rf.gd/gixelufenenilig.pdfIn PDF document text
    • http://ravenofudaviv.rf.gd/76880862119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5add1efe-422d-4728-920f-91c0b25524a3/blue_is_the_warmest_color_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5a0349-33ce-4d32-8b8d-af3985489a34/ponowoxumezuwixujavesi.pdfIn PDF document text
    • http://bavidatesudujig.epizy.com/baby_trend_playard_bassinet_mattress.pdfIn PDF document text
    • http://gurepabe.epizy.com/free_classical_piano_sheet_music_easy.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/14123640834.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_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 5072 bytes
SHA-256: edf399812e3559ad784b8f568305d8445dce953cc5e9ee2943534ebd5e400a22
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 9872 bytes
SHA-256: 64396447f01e962caaf7f318f62471f784917e8ef23a61c5bbb9a194473f81f4

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