Malicious PDF — malware analysis report

Static analysis result for SHA-256 731da324558e1af8…

MALICIOUS

PDF

77.7 KB Created: 2021-04-16 17:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12e7dbac70b59805b3cdeb0a8ee7b0d5 SHA-1: 914d499c3a0f90e131531c347660bf455f2770cf SHA-256: 731da324558e1af8e3a2bbfbb5f719e627c09b07b2dbd347b090cd76f265b153
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, with at least one, 'https://botokaw.ru/strik?utm_term=digitech+gsp+21+legend+review', being identified as a potential lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to redirect users through multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=digitech+gsp+21+legend+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5fe0441c14707.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/homemade_simple_cat_in_the_hat_costumezs90k.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/tlYgihf/spacex_crew_dragon_launch_date_time.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/zisexa.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/gjfWhjL/57200170815.pdfIn PDF document text
    • https://mewejubakokexal.weebly.com/uploads/1/3/2/6/132681976/vononutevelajus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_602a846dc0ef2.pdfIn PDF document text
    • https://cdn.sqhk.co/nevawanipo/idhgk3f/sexukavejubab.pdfIn PDF document text
    • http://reduslimitalia.website/bolojuwu43n9.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/968029.pdfIn PDF document text
    • http://sreda.city/dakipoxaxedabawawiv9m4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fd2511118747.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/ggSijgd/bujakokamazasofewobopesix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_6011da1832fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_60243ad31e908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_605833e0c36df.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/749b3eb0-66c0-41f5-840d-aa6c23de31f1/the_fourteenth_goldfish_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c3d55a-422f-4a52-bc09-366f3350b6aa/how_to_program_clicker_brand_garage_door_opener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10465dfb-c4d4-4639-bb65-c631a5d7976c/mivekam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9b31fd-bc7a-4a87-8ab8-7ac49d0e3fa8/11956807044.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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 5460 bytes
SHA-256: 824390a3c399f409129ead9bda4ac77c0659cfe039ab71d306d1efa32acfaf3a
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 11324 bytes
SHA-256: 3778fd8bb8dca0de1430ac3ebc64ac8968e609e8d263175f32ea7cb4fcc7b28a

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