Malicious PDF — malware analysis report

Static analysis result for SHA-256 a887799d51fb84b8…

MALICIOUS

PDF

70.0 KB Created: 2021-03-20 16:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a9d7f9c309f5f937af2911c621979245 SHA-1: 55d36bb3f0ad54f68e4ef9901fadc7f1d5d34e5c SHA-256: a887799d51fb84b83ae35185a14f92ad6b79bc376b29a8c91ba5186f99229168
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, many hosted on disposable domains, indicative of a link farm. The PDF's content, though obfuscated, suggests a lure related to 'esl imperative exercises pdf' to drive traffic to these malicious URLs. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=esl+imperative+exercises+pdf PDF link annotation
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/d8d401.pdfIn PDF document text
    • https://musagitunoton.weebly.com/uploads/1/3/4/3/134368320/1944820.pdfIn PDF document text
    • https://vetebifarex.weebly.com/uploads/1/3/4/0/134016991/tirakiji-gabokapede-dowegalapawez.pdfIn PDF document text
    • https://rivezotuxo.weebly.com/uploads/1/3/5/3/135337491/8210876.pdfIn PDF document text
    • https://xukaxibuban.weebly.com/uploads/1/3/4/7/134701669/bumekasunox.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/devevaxa.pdfIn PDF document text
    • https://xomaribimufad.weebly.com/uploads/1/3/1/1/131163516/nekida-buwimusaxul.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/522591.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/68c9bcf3-caa0-4be2-94a8-9a7919baeb99/52686669609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0b2465-1408-4004-b579-0e0280a5dd79/are_gluten_free_products_better_for_diabetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49600c96-613e-4875-bfbc-c11d98b3365b/petsafe_feeder_f02.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/chahat_song_full_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2015978c-469f-4b3d-9f22-6278805147df/muxokefugedizunalimuv.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_8037bc040ac64e0c8c168bb6cad53168.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb06d55f-02bf-44af-b1ca-93eef352381b/how_to_lock_sentry_safe_with_code.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/asus_zenfone_5z_android_pie_update_review.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_6728b5605310412eb2af423a2d239cc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0c127e-8419-4010-b55a-1716b99f8366/woromegimapudunasivaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/rusozamizolibef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddec7850-8ee2-4498-92d6-614cb1f71058/romeo_and_juliet_characters_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716af3e5-5ada-4351-8515-db9c8a5fbcff/brother_intellifax_4750e_not_receiving_faxes.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_9222258c08ea4beeb4e4bd34fec611f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4a72ad-8a10-40ca-9ef5-a2b7b5ff811a/6715328169.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_3dc1f2a9a606495a8725efda898da0e2.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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 5384 bytes
SHA-256: 4a4cc69a6e91cbb63ab6b9547cea693e414e002fdd45d84c1d4ba9b5efb45a4a
font_01_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 10868 bytes
SHA-256: f065cb274810a48f626e3412992a82f92a4cf45f33d348ae8c72e673c3c3ccf0

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