Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d79569e2df962e0…

MALICIOUS

PDF

73.2 KB Created: 2021-04-20 07:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 637eb0a37d06b6bab08c6e7099a95f39 SHA-1: c3771a1d814b0a41ccf7e7986500f28fc4141d5a SHA-256: 5d79569e2df962e0595283faa079a03744f0da2d3cbaeda2c8de1c89bce556e5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=around+the+world+in+80+days+moviesflix PDF link annotation
    • https://tatemisi.weebly.com/uploads/1/3/4/5/134596356/7860584.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/vexukisafajodez.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/61b0f49e865.pdfIn PDF document text
    • https://votetofovuwov.weebly.com/uploads/1/3/4/9/134901863/dikozodofuwoti-jesupizibawur.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/c5b9cf78e.pdfIn PDF document text
    • https://xuzomavarek.weebly.com/uploads/1/3/1/3/131383242/kixemuluje.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/e308f577-9270-4fde-8d7a-d567bd6e89a9/xorenexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3e9631-5036-40a4-8f07-122b7477d7de/months_of_the_year_worksheet_for_kinder.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_d2e0f526e73b48b69595e87f461ff1f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68066d4d-5b22-401a-a905-be82081f68bf/the_merchant_of_venice_2004_full_movie_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271a41aa-65a0-42c0-9b13-bd8fc85fbf70/fokazonegozijumifofud.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/85970306891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9703185d-aafd-45bb-80e0-e51547e872c5/the_walking_dead_comic_issue_126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8933613d-c919-4731-b63b-6b620471dd2c/38482289206.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_4e7051784b004f89aa6675987f7c5e96.pdf?index=trueIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_3486615b02b7489296d7ff2ccbefe43f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/millennium_falcon_owners_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76334eeb-af2e-48e6-b221-e778fe7f218e/this_is_amazing_grace_chords.pdfIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_dbf27806bef04f109e5f9609d63878c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/ffa_official_dress_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/behen_hogi_teri_movie_song_bestwap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8a9974-ca95-4fd9-8ec2-c37f5f139dc6/titaselu.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_8f073992d9b34b3ea9acc6a074640ab3.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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 5796 bytes
SHA-256: 65053adc05d8146499fc6866bc6b95cd303bca07e72a8cb945c1bcf442797307
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 10704 bytes
SHA-256: a6c32d8cff1937a0f50fbcc216767a070d1bbf8d3a526fca1afe957568df5f35

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