Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cf093ed0a0b3c7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 04:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 97190954e716196f9b6c40d7eaa7ad84 SHA-1: a14c269381f95226facea4730a5a5b3c2c9d5db7 SHA-256: 34cf093ed0a0b3c7da8254fbc7bb2d6c704a231083102acb49ebeae3f019af68
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 ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The document body, though heavily obfuscated, contains text that appears to be a lure, referencing 'how i feel today faces'. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=how+i+feel+today+faces PDF link annotation
    • http://lami-lashes.site/vozifekisojoxejiwozenu3zxw2.pdfIn PDF document text
    • http://megantv.site/735233457843fexr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_60296bec45db1.pdfIn PDF document text
    • http://dagulofevururuk.22web.org/83627575909.pdfIn PDF document text
    • http://airbin.top/kujebaxapezuruwuluzikarakt78l.pdfIn PDF document text
    • http://laxana.ru/5172433269pnzix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601e34f6ee808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fe58bf12c162.pdfIn PDF document text
    • http://famesodelazij.22web.org/votazi.pdfIn PDF document text
    • http://ibkreactiva2020.com/dilation_worksheet_1_answers98olg.pdfIn PDF document text
    • http://yoga-fitness.space/human_body_systems_flip_bookpbb9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcaa113a2ef7.pdfIn PDF document text
    • http://logvoz.ru/47513909534s3oly.pdfIn PDF document text
    • http://rcasino.info/jetil5ybgr.pdfIn PDF document text
    • http://copyright-supporthelp.com/pioneer_deh-80prs_vs0buqu.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/suzixegazunow/avatar_1_full_movie_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5ef76c-d775-43b9-b3d6-81361b7021d8/1385716515.pdfIn PDF document text
    • http://totexamivemasal.epizy.com/how_much_does_a_6_hp_honda_outboard_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/taylor_scale_target_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/letter_c_tracing_worksheets_free.pdfIn PDF document text
    • http://fewanepuwigox.epizy.com/a_discovery_of_witches_season_2_episode_3_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98fc45e4-6123-4e6e-bfd6-db2070805fd7/13650274580.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/2008_panasonic_viera_plasma_tv_42_inch.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/xudexadewe.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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 5076 bytes
SHA-256: 3709279ddd09448c1894ff5362631f5ccc8f1e0dca689a5339dc6b9da73fc561
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 10448 bytes
SHA-256: 06c979b22a2407d814484e703971987520014b3d21ef1dce8543a10ad613986c

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