Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc78141fc6f7d60b…

MALICIOUS

PDF

77.3 KB Created: 2021-03-11 03:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 134a7f6a668f67121ec0cea2fc362246 SHA-1: 5d199f30bdd47c383ab4a0dbb7165b0fe347505c SHA-256: bc78141fc6f7d60babb6d5d12c2c43f3f8df1b452e7f460f7a3215f817e0ce58
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high heuristic score indicating it's a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=shreyan+bhattacharya+janam+janam+song PDF link annotation
    • http://kirerela.iblogger.org/gerund_phrases_exercises_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_6018e3a351a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fd1c94cd24a1.pdfIn PDF document text
    • http://likelid.xyz/lazutikisederanazi25fm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_60457278634be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fc7a45ac4697.pdfIn PDF document text
    • http://ig-copyrightnotice.com/how_to_use_simple_compound_and_complex_sentenceswdco2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_60488d69a49c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jakiwokokik.epizy.com/lukukixo.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/bahara_bahara_song_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02034aa-170c-4506-bcd8-fe9470abd7e3/25362359874.pdfIn PDF document text
    • http://doxikejopem.rf.gd/nekisokifirufava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06411e45-d271-4603-920d-34b872416df0/61315714657.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_f79c6a123eb143eea146a4c7b8934f43.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_8f3647afd9e24272969a680c4ff52bca.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_a502e7ad00644c62a732292a2d69c238.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98c1416-6d6a-4e72-a29b-97def0c2e833/dell_latitude_e7450_used_price_in_pakistan.pdfIn PDF document text
    • http://saxopurokike.rf.gd/brahman_naman_2016_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7956bc-d7d1-4734-9490-ea14bbe12ba4/rijubusoxadoxel.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_57855f6fe09a44b6acc6546a9c0de8e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/leladasojubibuxiwabujeme.pdfIn PDF document text
    • http://pabovabavuwemet.rf.gd/my_best_self_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/gadonekobobegilolawepiba.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/ags_beers_criteria.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 5604 bytes
SHA-256: d870c8ea5f1c620f798e2a9974a8d23730cab787604315704373ff7938775ab5
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 10532 bytes
SHA-256: 5ec123019f49ff4b4dce7a9464c53f685c568f61d114fd061b0a2c897bcdbcf6
font_02_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 17740 bytes
SHA-256: 8e308b97037abd9ea541ee16c1dc5fff5c9daf4ee7afddb7f1a1a142755d4e4d