Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e52f3afabb5c75e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 21:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 12d2bfd83f6bc7272f1f395e78e6509e SHA-1: 5519e27156a06a6c1229327c8612f1a34072864d SHA-256: 2e52f3afabb5c75e34f849e89d882025847dcd5ab0027f9c3e830b26f02507af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=analytics+meaning+pdf PDF link annotation
    • https://dirovobu.weebly.com/uploads/1/3/5/3/135319654/4787277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_6052ee4069ce1.pdfIn PDF document text
    • https://fezugewibopav.weebly.com/uploads/1/3/5/3/135346468/6df3f4630e.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/actos_del_hombre.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/8158906.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/add_subtracting_fractions_and_mixed_numbers.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/stand_up_speak_out.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/92a1f0b4cf6.pdfIn PDF document text
    • https://gurivarux.weebly.com/uploads/1/3/4/3/134309953/3871723.pdfIn PDF document text
    • https://bexulijariva.weebly.com/uploads/1/3/4/8/134885506/6543248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_6058dab6733dd.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/bajuka.pdfIn PDF document text
    • http://turoliwejaxafux.22web.org/20703122745.pdfIn PDF document text
    • https://gevivakeje.weebly.com/uploads/1/3/0/7/130775257/6228306.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/zerejibixupav/fugugilorewutimerofozow.pdfIn PDF document text
    • http://junaken.onlinewebshop.net/10835448748.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/ramepovamenuz.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/african_music_history.pdfIn PDF document text
    • http://fakesux.epizy.com/are_school_closed_on_veterans_day_2020.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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 5472 bytes
SHA-256: c32d0278ac1ae0f83cf9c6ca8e7a2683ed60f22ebb56d5977b126234558651a8
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 11228 bytes
SHA-256: e5291d0205364b130d4e38b0543c54692abbf90de4d962f1b5f3b68b3e10c79a

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