Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2a61cf23220d8b…

MALICIOUS

PDF

90.3 KB Created: 2021-04-19 18:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8791c301ca486ce842b49b6ee8d4561f SHA-1: 983f7b4e88fe5e81fd5a6f72ff381769c6709635 SHA-256: 7a2a61cf23220d8bcd359a7f4bb7c490e848e09f8e42641f689c166e0c4fbd39
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, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. Although no scripts were extracted, the structure and embedded URLs strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=signs+someone+really+like+you PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411701/normal_602fb08feb1de.pdfIn PDF document text
    • http://malespw.xyz/lawn_boy_lawn_mower_leaking_oil_onto_deckqjp5s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_604cc3b46893c.pdfIn PDF document text
    • http://ig-soft-team.com/chashme_baddoor_full_movie_in_hdvd3mx.pdfIn PDF document text
    • http://mpvideo.org/atlas_copco_food_grade_compressor_oili39nr.pdfIn PDF document text
    • https://tegimawemax.weebly.com/uploads/1/3/1/3/131383609/8422922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_6043ff14bc989.pdfIn PDF document text
    • http://zanexipizuzog.iblogger.org/atipia_coilocitica.pdfIn PDF document text
    • http://bellissimo.online/what_percentage_of_hospitals_use_ehr0gejm.pdfIn PDF document text
    • https://gekubuneka.weebly.com/uploads/1/3/4/0/134041200/4589263.pdfIn PDF document text
    • http://sunny-web.ru/solving_congruent_triangles_worksheetw2smv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_5fd8bcac5f398.pdfIn PDF document text
    • http://dupozixafe.iblogger.org/jibowodavedoxeri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482228/normal_5ff2bbe7bd63e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_6037ce51f3d00.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/8187801.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/8b45f2f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruraduwajisiv.rf.gd/best_money_market_interest_rates_in_nj.pdfIn PDF document text
    • http://fadakivok.rf.gd/73570854797.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_ad4128faa39a42c286ac90b10b1cd106.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_e83ae0900167425eac9de1aa86cdc24b.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_5677744ff41144b1a20b01b54151d321.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 5276 bytes
SHA-256: 9f66b4618ec0a642a45c38e240854dcaf32427784f721e9abd1f1d4303f04216
font_01_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 10904 bytes
SHA-256: 27cf36c96ec65943506c41a8c65ada42ef6fd4bcdbfd3040a3b33e59e5fc9462

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