Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a05b11574bc7892…

MALICIOUS

PDF

75.6 KB Created: 2021-04-03 02:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9d9d7385e21ac1acb4e8840f12b04c93 SHA-1: 14fca5342baf43c712f2f6eed4c2258431f1c634 SHA-256: 4a05b11574bc7892e1277d511220720810ac08d897b9a8f5be30d990108dd40b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one prominent URL, 'https://resalured.ru/strik?utm_term=how+to+resolve+bbb+complaint', suggesting a phishing lure related to complaint resolution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this PDF is designed to host multiple links, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=how+to+resolve+bbb+complaint PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424991/normal_60205a73a5bdb.pdfIn PDF document text
    • http://swiss-gear.store/handover_checklist_word_templateyczhz.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/xizidet.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/d36jiVS/digital_class_rewards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481820/normal_5ff25169b7665.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/6964982.pdfIn PDF document text
    • http://whitetwo.space/94851014120khgcx.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/dcic6ih/85784792602.pdfIn PDF document text
    • http://rollernefritmassage.xyz/migifijtvsfm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_605acc413ba9b.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/ahcbSgd/ez_loader_dual_axle_trailer.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/1301134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5fd0bb1b41737.pdfIn PDF document text
    • http://alsamcctv.com/23704511202gmoc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_cd9c69878475486c926eedb7f7f454e0.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_eb355fc3ee3b4adfa860236b87f726a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/c_o_form_e_china.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/2002_club_car_golf_cart_seat_covers.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/aeroplane_games_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/honeywell_wifi_thermostat_not_working_after_power_outage.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 5332 bytes
SHA-256: fb144c3191d698c97b1ba05d2b6a333effbede94f8e1bad30134a9aec4918685
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 10880 bytes
SHA-256: f0c2d0d44c2433a52ff1b240cd26ba433412844d9b50f12934c7850d2d82fb8c

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