Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6f7eff69348781…

MALICIOUS

PDF

86.6 KB Created: 2021-02-28 13:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 85bc7329f73095aa945ee1e7a7a6c2c5 SHA-1: 2dcafe640f700def3b06b854c1694ec208504622 SHA-256: 8a6f7eff69348781fb3be1d790e8daf2a65655f5b3e0ddb6bf8de34271096fab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to lure users to external sites.

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 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://bologen.ru/strik?utm_term=how+long+to+store+lettuce+seeds+take PDF link annotation
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/pogodusapuxid_jesomeb_wuzoz_zajimat.pdfIn PDF document text
    • http://gdztut.com/oster_convection_countertop_oven_walmartgvk79.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/b85e2f93183.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/YhbiKCj/41503801446.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/1570923.pdfIn PDF document text
    • http://max-lifting.store/the_dark_book_rpg_offlineezeth.pdfIn PDF document text
    • http://scm03.ru/how_to_change_time_on_esi-dex_phonem1zdd.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/hBhijc9/slap_kings_mod_apk_1._0._8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_602b058e12074.pdfIn PDF document text
    • http://ericksandoval.com/fotutojirejosivizofoda9nm.pdfIn PDF document text
    • https://fujikoxeloto.weebly.com/uploads/1/3/5/3/135307408/1461c13fa8.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/4972476.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/kijawogixuzewif.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/pibwzid/murder_hornet_sting_symptoms.pdfIn PDF document text
    • http://inostrana.com/fleetwood_mac_dreams_drum_sheet_music3osxl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bogeguva/nojaririvulojomijomiki.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_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 5056 bytes
SHA-256: 038b68b4741bf80a062a862814fc8318d39c99e3672a1c2cc656c16ec28b176d
font_01_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 10652 bytes
SHA-256: c74e84a78c9acbff32ad5309a1ef87cd7e19ceadcefc41fff5f5b5da0caed33d
font_02_sfnt_off00013ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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