Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1baa0853bdc6a94…

MALICIOUS

PDF

81.7 KB Created: 2021-03-07 21:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d9612c0111334dc84544cd6e9144dc0b SHA-1: b069b006e7d06ac7a4eda82de7bd6e7cab8f2119 SHA-256: c1baa0853bdc6a94e70176014c9915561ec424c71bbebf5c54d541216997f58e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a significant portion hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=what+size+battery+for+ford+3000+diesel+tractor PDF link annotation
    • http://wirobigi.medianewsonline.com/masnavi_rumi_in_urdu_read_online.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/60470440413.pdfIn PDF document text
    • https://cdn.sqhk.co/mubikidom/Dhghhhb/weed_eater_repair_service_near_me.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/lesalirudirere.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/iqhbBTg/war_of_conquest_canada.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/pamiletipikivani.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/iK1sVNX/50289066437.pdfIn PDF document text
    • http://usblighter24.site/adeptus_custodes_codexsmc4s.pdfIn PDF document text
    • http://milanomoda-italy.website/mans_best_friend_with_benefitsao5e1.pdfIn PDF document text
    • http://healthyforczechrepublic.site/admin_password_breaker_software_freetfn86.pdfIn PDF document text
    • http://bigtittybella.com/cambridge_english_test_b2cqv6o.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/djahhjk/farm_animals_cartoon_pics.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/7de1c4a2-18b3-463f-bf04-ede698e47be1/84762147416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9268fcaa-5f07-40f7-85e4-3906ce910d74/when_do_you_use_privileged_and_confidential.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/make_your_own_dryel_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/40725077792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce12ec6-e4cf-4a11-b7e4-df7c75aa07a4/11489348786.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/not_quite_black_and_white_game_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b902498f-8be3-4f23-99e9-957502ff69d8/nibepoped.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/30689597919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131eca70-ff85-4b28-9550-be40b27cb539/which_is_the_drain_hose_on_a_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1c0c8c-4418-4910-abd5-f54a9bca91ec/68790406538.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 5720 bytes
SHA-256: f82f76bd72fecf2ff4a882a3ad7428338dde0aa13d9d5bf856fe1959ffb773b1
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 11352 bytes
SHA-256: d582bebcd283513a1fb669525e3f1fd253a18540da1f67afec9713d084147b79

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