Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5d54da850df306…

MALICIOUS

PDF

72.2 KB Created: 2021-03-21 05:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a3814c699f3f13e7bac1f64f6dcf71a5 SHA-1: b020bf768f08783862d0712d6d194b870a0d3e58 SHA-256: be5d54da850df306519a7531e8afac042c064115a5122206e8c037b33e842030
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

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://jumiwimov.ru/award?keyword=malaria+microscopy+quality+assurance+manual+pdf PDF link annotation
    • http://xadikefivo.iblogger.org/what_does_the_bible_says_about_divorce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452593/normal_5fcd6580244a3.pdfIn PDF document text
    • http://brumbum6.xyz/what_is_the_suggested_order_to_watch_marvel_movielgmtb.pdfIn PDF document text
    • http://alkim.xyz/bibupisujubupowanuwifina4hoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601f242ceee1e.pdfIn PDF document text
    • http://soul-felt.com/hitchhikers_guide_to_the_galaxy_42nd_anniversarydfw83.pdfIn PDF document text
    • https://cdn.sqhk.co/nedevupoj/geMajfj/75380291119.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/XYqAuif/scary_teacher_3d_mod_apk_hack_android_1.pdfIn PDF document text
    • http://capridigi.com/71531023463wjqx2.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/c9idiek/fujakufogipawosazameburuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_604e8b4bd0e70.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/SYgJkv7/czu_evacuation_map_santa_cruz.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/FSPhiVZ/hoop_league_tactics_nba_roster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gepaboveron.epizy.com/14703538529.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_c172045d908c41d1b05717a515ffe92f.pdf?index=trueIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_13aa835ac4dc4099a4f7b1b84899304b.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_95b3facb8a4c44f595ef491f4cd7a63f.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_578c6a9ff9e1469a8d3fc7f8a56d1cac.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_0173eaa09db74ab89bd4a822e92022ec.pdf?index=trueIn PDF document text
    • http://jajabadexorulab.rf.gd/play_blues_guitar_chord_progressions.pdfIn PDF document text
    • http://karababeso.rf.gd/que_medios_de_comunicacion_existen_en_internet.pdfIn PDF document text
    • http://tujufevowupise.epizy.com/average_grade_point_average_australia.pdfIn PDF document text
    • http://sabuxixu.epizy.com/zuvovivevimetepugu.pdfIn PDF document text
    • http://mosupemerumen.rf.gd/snapper_zero_turn_lawn_mower_owners_manual.pdfIn PDF document text
    • http://manepiri.epizy.com/dotij.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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 5532 bytes
SHA-256: 4d3f96e409a5f857cea42dc7478efebfe815e3c2e14155eb1ecc6266b59a277c
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 11152 bytes
SHA-256: 93a6d0ee63bd884cb3e7c212de85fe06b7ae6b3a3a85511274bafa34dc1a37db