Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c61eff7bac19a29…

MALICIOUS

PDF

96.8 KB Created: 2021-03-16 00:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 63907a32954404f7c72623b2df7e686b SHA-1: 9f162313adcbbf7b25b9e64285cb13e38deed963 SHA-256: 4c61eff7bac19a29f3bd707171dd28f878975fd0b0ef1ea0ad7bc6c39f04079a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://seumenha.ru/wix?keyword=profit+and+loss+statement+for+daycare+business PDF link annotation
    • http://bivoliku.mywebcommunity.org/amidinas_veterinaria.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/24162391656.pdfIn PDF document text
    • http://desokore.medianewsonline.com/que_significa_copla_de_arte_mayor.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/29f1771d-e453-47ce-a2cc-35bc1fe5855f/samsung_front_loader_washer_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdcc4c21-98b0-4586-b37d-30f361d79480/nancy_drew_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/83648261093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c63949-7351-4925-9e24-afc372d325fe/levifijufotilemujatiduvu.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_152fd6886a0445ee93e9dc4491f1e1bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c092686a-07ce-4f15-8f5e-56be3d200a05/shark_lift_away_deluxe_loss_of_suction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eaca08-cf27-40fe-9f4d-bb802ebcebba/mahatma_gandhi_autobiography_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c929b8-6c4a-4d49-9c32-74beec0b38c5/how_was_virginia_connected_to_the_brown_v._board_of_education_decision_quizlet.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/trig_identities_examples_with_answers.pdfIn PDF document text
    • http://jezawijevot.rf.gd/zukikizetimupajat.pdfIn PDF document text
    • http://bubewap.rf.gd/check_your_english_vocabulary_for_ielts_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bcfa38-01d4-421b-8857-ac0159313611/paulo_freire_pedagogia_del_oprimido_resumen_por_capitulos.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/probability_theory_and_mathematical_statistics_fisz.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_111c904f17524f589b4f1e64438e2825.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/483b16e2-7a49-4d03-bdb6-d424f8199bfa/10050235058.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/37157851911.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_558aee34de734470ae5c9e675c735508.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4524b4d-c9d2-4ec8-b023-79c6a490aa9c/31560132211.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/bradford_white_gas_water_heater_installation_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00013e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1C 5412 bytes
SHA-256: c11c757e820b976675f3888655156aa8d319863519c07325e5ae73cc1cafd78a
font_02_sfnt_off00015073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15073 10628 bytes
SHA-256: 167bb7b53c89aad92041063d19e9b1068eea57899dc5d4211175ade44bc2c13c

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