Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabc115c2bf4473c…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 09:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a584e76133a3bdc6e147e0c0140a9a39 SHA-1: c85d4bc6d8e7412f84310b24f8a1b670f3076e95 SHA-256: dabc115c2bf4473c283b2bdb59729aab541007997c7516c48540be7d42716df9
146 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a study guide answer key, aiming to trick users into visiting malicious links. The presence of numerous external URIs and link farm characteristics further support a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=chapter+4+study+guide+forces+in+one+dimension+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460677/normal_6052b3ab9447d.pdfIn PDF document text
    • https://cdn.sqhk.co/xawemubimaj/7jGNbge/one_year_calendar_2020_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_605c3a8a76f15.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/Ohejgxh/jizubenagozupugabimasosu.pdfIn PDF document text
    • https://cdn.sqhk.co/muxuzoxipopa/jahf7hf/great_western_bank_online_bill_pay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_60320239d4691.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/8hbjfVV/download_bgn_launcher_apk_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384463/normal_5ff2d2031861f.pdfIn PDF document text
    • https://cdn.sqhk.co/pejibuti/Wjan8C9/70519917025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozidonozali.myartsonline.com/nuxetiwufukaba.pdfIn PDF document text
    • http://jokosen.atwebpages.com/wotavofekuka.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_e07906a098aa4ddb91232f7cd95e00e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/bose_acoustimass_9_review.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_6912c534586b46318fa9d704b61c1b7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/battlefield_bad_company_2_mobile_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/lonakoronorole.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/malibu_outdoor_lighting_system.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/the_complete_sherlock_holmes_volume_1_summary.pdfIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_572e0d42d66e4397a5d6a0dc8fc6f2d0.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_7c8fb38c832548b8ab8d21a6474c7492.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 5788 bytes
SHA-256: 9451a8e898db38c320f9c8982f7b09690648e0b63947388cd76640e3bebc6d8e
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 10768 bytes
SHA-256: c57c608d0abd64cfd2fe1323a00e2ae2ea0fb9eb8a9c84c9b31d8446465bb384

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