Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0e53d723c0c147…

MALICIOUS

PDF

80.5 KB Created: 2021-03-11 20:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5eca2a8f6924ac9874610bf2b34c3b3b SHA-1: 1c2b25b86ba6cc7c5817295816d91514943c8ad4 SHA-256: 9e0e53d723c0c14726cce017b57fe30e7e06c777e344a09dc1416270392734e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, with many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=best+division+2+schools+in+north+carolina PDF link annotation
    • http://damvglaz2.xyz/sharp_aquos_60_inch_tv_20102uupu.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/c68292.pdfIn PDF document text
    • http://okstore.info/purelusuwujawuluda0r7ek.pdfIn PDF document text
    • https://ponivigaxuk.weebly.com/uploads/1/3/5/3/135313456/giwilixarosowu_nojunugawu_senotopawez_gadexobud.pdfIn PDF document text
    • http://thedouche.xyz/74519384799aao1f.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/5201184.pdfIn PDF document text
    • https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/b52994681.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/jfbijjr/helicopter_robot_game_apk.pdfIn PDF document text
    • http://presalon.xyz/comma_splice_and_run_on_sentences_worksheets_with_answerstn68g.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/bebizunegano.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/nasosi.pdfIn PDF document text
    • http://biomaniks.website/95621096124ejbqp.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/ligy1XF/10807832564.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/6gg5BCg/ice_cream_cupcake_maker_doll_making_games.pdfIn PDF document text
    • https://vasirorikipik.weebly.com/uploads/1/3/0/7/130776585/gapidod.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/xisefaga.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/gajabedafot/is_every_living_thing_have_a_heart.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_a33734ca6eb04524b1fec9696c823d7a.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_961bb737b58c452495ccb9e4aa695982.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_47c996ae9c3d4cadac64a4322a85afaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubeto/tirasafenezosemibumaxefo.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/luwekikawiro.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_fff758ba66ea46748b223ac33432f069.pdf?index=trueIn 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_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 5268 bytes
SHA-256: a0d53e69048429e29a88917791b4b62278b8dcf7f0d1acd9704b450a06853b4f
font_01_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 10936 bytes
SHA-256: db17dc137190aa0dca5a26cc6ec770ce2e9b4c103fa1c51aebbc6638edcfb392

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