Malicious PDF — malware analysis report

Static analysis result for SHA-256 485f4d4838975e2e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 13:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c27ac82d2ccc529fd93d228d042c557 SHA-1: 8e3f4c0adfa0329a20e5764ea61876dda799a1f6 SHA-256: 485f4d4838975e2ec3b5244c50114cdb174d57322a66f6ce3a3ed59c183a1e49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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://midufefew.ru/award?keyword=animal+parasitology+pdf PDF link annotation
    • http://nakalabaxis.mywebcommunity.org/aopa_pilot_magazine.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/57790968635.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/how_to_be_a_good_dm_for_dd.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/dunejapusorefuk.pdfIn PDF document text
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/ccb0e.pdfIn PDF document text
    • http://icub.tech/kesows9xyg.pdfIn PDF document text
    • http://bluebadgeform.com/words_their_way_spelling_inventory_grade_1zj9d4.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/ef2b31a257af8.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/weresimedimivux.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/fosivaraw.pdfIn PDF document text
    • http://ewwe.space/tawolepodaxojan4717n.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/d5a7f667-27b3-4d2b-9374-40b4dd091a74/trials_of_apollo_the_burning_maze_epub_free_download.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_868d1d3a503443758bc97e34d2c69aa3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1be9488-f81a-49f0-bc64-b8f102402074/are_tv_power_cords_interchangeable.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_425858c6462445f6bdb60cfa01e076f7.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_bbfbedaa4fab4c0383ff3d72a26cafc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/799708fd-41b3-434f-a98b-7058a079c955/meaning_of_english_word_metaphor_in_malayalam.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_6fe7872c7aa443b98bb83c8bb2c3a9cf.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_f073ce088e5a4132a5c7d81ae132aa90.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 5452 bytes
SHA-256: 50ef4857e3274899a1b7514c73716d9ab0e8311a132e6a9c122b2bae0f9961ff
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 11432 bytes
SHA-256: 6210a23e4e988428759ffe3209db25636b18e993d29352ab763bfd57aaa2c2e2

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