Malicious PDF — malware analysis report

Static analysis result for SHA-256 050b5a8e85f72005…

MALICIOUS

PDF

65.4 KB Created: 2021-06-12 17:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e8def19c7b973460035a59818dfba6c8 SHA-1: cea5e22ee4e4720559b8c9aca7f3ee553e88edc9 SHA-256: 050b5a8e85f72005e351d2a3b11f9c12e160ec35436c5b06406430a1aa98447e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable domains and exhibiting characteristics of a link farm. One prominent URL, https://smidgel.ru/pbw, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/pbw?utm_term=logica+simbolica+irving+copi PDF link annotation
    • https://julitigifoxa.weebly.com/uploads/1/3/4/3/134310533/numejofemamef_jepejanilisu.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/4662961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_601ac0a64d749.pdfIn PDF document text
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/timokevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_603c204fe53d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujimowiwup.pbworks.com/f/83232194511.pdfIn PDF document text
    • http://zotugon.pbworks.com/w/file/fetch/145118583/daxomomuwuposamupat.pdfIn PDF document text
    • http://mosutit.pbworks.com/f/ravebapalug.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144422928/lujojebo.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144428376/99867638851.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144427746/what_personality_type_is_most_compatible_with_intp.pdfIn PDF document text
    • http://pajawazo.pbworks.com/w/file/fetch/145013766/roman_number_of_100_to_200.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412374/calories_in_south_indian_food_chart.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144655590/brawl_stars_hile_apk_indir_android_oyun_club_son_srm.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/les_animaux_fantastiques_1_livre.pdfIn PDF document text
    • http://juvudibip.pbworks.com/w/file/fetch/145151688/31497579415.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/145087368/the_sims_4_apk_mod_download.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/f/percy_jackson_and_the_lightning_thief_alexandra_daddario.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_off0000c203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC203 5396 bytes
SHA-256: 1d1e1633242e3996cfc806915b78510fb5149e3dd8e0c0bb65fad21dbfa7510a
font_01_sfnt_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 10408 bytes
SHA-256: 0d6a4fc7951868fc7b88fc5d97a0e4b361f857a87749517dc5e9483ab3c729f5

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