Malicious PDF — malware analysis report

Static analysis result for SHA-256 42638c6fdd9bc5ce…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 02:38:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4d5853a53f2fce76c62d45269d09dd1b SHA-1: d20bb34c3899b4e437106e811afe2cecb0ee52ee SHA-256: 42638c6fdd9bc5ce1e4c24d395bbbc114b5096edb056b9b01934845cfefb382e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('ponafet.ru') that is likely part of a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/wix?keyword=cset+social+science+subtest+1+study+guide PDF link annotation
    • http://zesaguzijor.mypressonline.com/what_order_should_i_read_the_me_before_you_books.pdfIn PDF document text
    • http://organicsss.space/thermo_king_alarm_codes_102y4bn.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/hgLgiRO/wujarajosifixanefop.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/betalactamicos_veterinaria.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/gXjc3yJ/baseball_playoff_teams_2020.pdfIn PDF document text
    • http://klossheff.xyz/sezadalasalusosuzebivumhhus5.pdfIn PDF document text
    • http://tesocoin.online/words_that_start_with_stuuwbaj.pdfIn PDF document text
    • http://copyrightreports.com/toefl_practice_testqf94k.pdfIn PDF document text
    • http://appeal-ig.com/4292005103q92up.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/lobiraribixefe.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/0c99cfe2-a6a0-49e9-b96e-a95d9a4ea31f/zubosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bfdbba-5ab2-43ce-ac85-da6f06604a85/kerodugejolonajafimidatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00475c94-a13a-435e-bce1-258866674073/dituwobepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1ec1e2-31be-4a33-9186-02b08654a2b0/33611135958.pdfIn PDF document text
    • http://widifusi.myartsonline.com/ir_table_functional_groups.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fae6e2-f959-4fe2-a2c6-a83f75544184/6445617790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c19755e-750a-423a-930a-967bfdacffdf/sundarakanda_parayanam_tamil.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/49185235984.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_to_light_pilot_on_williams_wall_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6553ca-cc85-4a15-a8ce-e004ab24ff6e/45726285750.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

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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5212 bytes
SHA-256: ec3f790964d9f70a50f5b5907c9fc7777460cd4b2140b9d3f095a7a708054f92
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10524 bytes
SHA-256: 7eb0f12c27d2535b380a3fadb3a91dff9ebcf262d8b4ffb3a7c6a8839b33457e

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