Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95f7e7fb55dc5ea…

MALICIOUS

PDF

92.0 KB Created: 2021-03-26 08:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 33010ef21ac6bc5a0658ab19a11497f5 SHA-1: 2b47985f180693f69edcd6fb9fa8ee1ad57454a5 SHA-256: a95f7e7fb55dc5ea4a4f163358b897d0fe2713f7f0e624476205981d7ce6fc4c
126 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, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational content ('lesson 4-1 unit rates answers'), which is a common tactic for phishing or malware distribution. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=lesson+4-1+unit+rates+answers PDF link annotation
    • http://fakojel.22web.org/gazadewukexo.pdfIn PDF document text
    • http://topvideo.design/risipitumawanisajasilaxibggk2c.pdfIn PDF document text
    • http://instapodarok.site/autocad_2013_64_bit_highly_compressen5htw.pdfIn PDF document text
    • http://clientbluebadge.com/vatupadabukhudzk.pdfIn PDF document text
    • http://indonesia2health.online/pokemon_glazed_full_pokedex0azwk.pdfIn PDF document text
    • http://top-shop-store.website/present_simple_verb_to_be_worksheetssvl5r.pdfIn PDF document text
    • http://55571.ru/how_to_get_a_cdl_learners_permit_in_ncuh1fz.pdfIn PDF document text
    • http://wildboost.club/angels_of_abundance_oracle_cards_review72tww.pdfIn PDF document text
    • http://verification-help.com/graphic_novel_the_coldest_cityh1l2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://libowilibedu.epizy.com/yakuza_0_mr_libido_guide.pdfIn PDF document text
    • http://potubavaziripek.epizy.com/55392105866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0837b359-2235-43eb-b704-b941755d1a5d/puzuxukesofagiwivule.pdfIn PDF document text
    • http://livofos.epizy.com/commandos_3_for_pc.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/tebibanekebufikosufemulut.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_982047c57aec4e0391ea868c953298b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a31862-6773-4822-b182-e1cdce9d0a29/how_to_work_out_arbitrary_units.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_c1a1d7271eae4a44854b607e9dd1a8a3.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_45224c3181ac446db3c0161db120b36b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/073be52c-7b37-407f-a3a7-1628d12e838c/97832863745.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_f5c9103942be459c8b83390dd693416a.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_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 4852 bytes
SHA-256: 4efec58cd5a080b9f441ab7525ecb521ec7bc347f2e8531219b698ae74520764
font_01_sfnt_off00013b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 11668 bytes
SHA-256: 2fd81dd4fb7b76f413009b7845659a9f67095de0b6ede267225f3b06fe5bb29b

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