Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1d72bd70e5b9c8…

MALICIOUS

PDF

77.4 KB Created: 2021-04-07 23:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 45bd7b5d9121b8ae44a648872e0b2be9 SHA-1: 1be114eb21158f537228af527abff2e54aa48b0a SHA-256: 5c1d72bd70e5b9c8d69da2a7b5123cc61c1d01210d97d6ace711a5f234818f88
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, directing users to potentially malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=adiatek+baby+43+parts+manual PDF link annotation
    • http://foxilajat.sportsontheweb.net/rorudikoverevuvamo.pdfIn PDF document text
    • http://xxlmature.site/flight_stability_and_automatic_control_2nd_editionvz8s9.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://regsenatvumen.website/the_virtue_of_selfishness_critiqued15me.pdfIn PDF document text
    • http://trickyturkey.com/37308281562umj42.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/kenmore_series_400_washer_stuck_on_sensing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5fe177b43ef40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_604d9c6318781.pdfIn PDF document text
    • http://vovality.club/81514783952jfo4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_605f8cc85ba38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_cf52731af00041be8dc9dd80d8f346fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/65511357733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595aeafd-6f25-45d2-a9c7-761d33193471/najoronuzarive.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_90d5ae8634044129829dfbe82afffb43.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_ecb4435fd4ff41d1822706af0d9fd5d0.pdf?index=trueIn PDF document text
    • http://jawuwibunoropo.atwebpages.com/canary_wharf_shopping_map.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/atelier_bow_wow_behaviorology.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/learning_english_speaking_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5f5f78-4a9d-4c46-9019-a75446c55aca/acurite_outdoor_clock_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33455c9-d25c-423c-8ee7-42fe0a42a84b/scs-2u01_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d232419e-808b-48b2-bf75-9a8caff0aadd/how_to_use_brother_label_maker_pt-h100.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/407313511.pdfIn PDF document text
    • https://c93ae04b-3d95-4128-ac62-0503c91a26e1.filesusr.com/ugd/002f5e_39932137a18149cdae2c8c7d6395f852.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/33123622533.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_7103668c55334d3bbae9cc0d0935d081.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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 5652 bytes
SHA-256: 94c5245ee65f30236b65d789d4568dc986d8a88911bab85c3a3b264d20e9e632
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 12656 bytes
SHA-256: 2877b0bea1247fe9e887516194c23b6adea265cade855c23daedcb0c8e0b6d34