Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce384367ad9c89a…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 04:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d36f8dc2fd12819c0ba4a2d7333b4551 SHA-1: 242a9eceef78158a28a3b58f68ad3abaa3438745 SHA-256: 3ce384367ad9c89af8e841ce2b914e080bf697068b0b950312dd05d16732d67d
214 Risk Score

Malware Insights

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

This PDF file exhibits critical heuristic firings indicating it is designed as a link farm, repeatedly embedding links to external URLs. The primary malicious URL identified is 'https://nipisod.ru/wix?keyword=just+ask+bob.com', which is likely used to deliver a secondary payload or redirect users to a phishing site. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=just+ask+bob.com
    • http://wodedutipif.medianewsonline.com/introduction_to_management_science_quantitative_approaches_to_decision_making.pdf
    • http://datinge.site/66434455810dgct8.pdf
    • http://carinsusa.com/sodastream_black_friday_deals_canadas8enz.pdf
    • http://lighterusb24.site/lic_agent_report_form_3800h3ba.pdf
    • http://mexicotop.xyz/17973518892kmvbb.pdf
    • http://febiterozoz.medianewsonline.com/contract_mining_agreement.pdf
    • http://copyright-help-report.com/niseguvazijurainldf.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/bash_scripting_language_extensioncnm66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/begijufadi/hp_officejet_h470_printer_offline.pdf
    • https://uploads.strikinglycdn.com/files/1cc079c7-063b-41be-9c56-6a01274b0ec9/fewezedifekidajo.pdf
    • https://s3.amazonaws.com/zulezov/77567528604.pdf
    • http://punotonaduwize.atwebpages.com/94756046025.pdf
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_07195fbeb06d40478a8bfa5559b3bc94.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/79452000609.pdf
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_203ba9d0058945c3aab16a2b7cebc0c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6b552146-2787-4e51-885f-27c6c4f86d88/how_often_does_a_2018_nissan_sentra_need_an_oil_change.pdf
    • https://uploads.strikinglycdn.com/files/e28d75d6-03f1-4507-bb5e-60ebdf98dba2/how_much_is_yamaha_motif_xf8.pdf
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_e38e8daedb3f4697bca6fb972ec8fc2b.pdf?index=true
    • https://s3.amazonaws.com/nuselufuzo/investigative_report_template_free.pdf
    • http://romakilax.myartsonline.com/vasculitis_poliarteritis_nodosa.pdf
    • https://s3.amazonaws.com/libeganot/italy_travel_guide_food.pdf
    • https://uploads.strikinglycdn.com/files/526772b1-ef56-471f-9770-4b3f0c559caf/igloo_ice_103_user_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e950.bin
6903a62f1e61ead9c34a4b2b5e8380cf33677a0d44ec8f13ded39a95ce205a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 5040 bytes
font_01_sfnt_off0000fa72.bin
755a2b0da6700ed4226046cc137c5979fca018ef88f53e2bc405b979aa4920e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 10880 bytes

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