Malicious PDF — malware analysis report

Static analysis result for SHA-256 e911a81cf2fbc240…

MALICIOUS

PDF

70.8 KB Created: 2020-11-09 23:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e508ba216cfa2287a7ddd85acfe6ff1 SHA-1: 9edc6f11b345966d4f5034bd141711b5bb0ad65c SHA-256: e911a81cf2fbc2403ec8a47125cc01beeaa99578c2a3a49a4f835fe5f992da1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing indicating a link farm with numerous external links, including a primary target URL. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to direct users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?keyword=mckinnon+furniture+seattle+wa+closing
    • https://zukinubugepar.weebly.com/uploads/1/3/4/5/134514864/0f4fe06776b25.pdf
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/e22e4e7604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/08d091b6-1b64-434d-9f30-17bd8b48682b/98811513531.pdf
    • https://s3.amazonaws.com/nafibanefexex/80181370784.pdf
    • https://s3.amazonaws.com/kisimujuk/bmw_brand_identity.pdf
    • https://uploads.strikinglycdn.com/files/0c3e930d-cefd-4cc0-8513-54b6e501697f/craigs_list_lubbock.pdf
    • https://s3.amazonaws.com/wavunot/list_of_adjectives_synonyms_and_antonyms.pdf
    • https://uploads.strikinglycdn.com/files/6db84487-fed3-4192-b99c-ef073cabbb69/untold_scandal_2003.pdf
    • https://uploads.strikinglycdn.com/files/aaff46bf-5d22-4510-a22c-bdf3751e9821/wifewatowe.pdf
    • https://uploads.strikinglycdn.com/files/04ecf4d7-0336-42fc-bf2a-8cccc69e2249/wxformbuilder_tutorial.pdf
    • https://s3.amazonaws.com/safago/direct_express_debit_card_payday_loans.pdf
    • https://s3.amazonaws.com/bajapovogam/rujifulizimanuku.pdf
    • https://uploads.strikinglycdn.com/files/56780491-d54d-446a-8b54-89cfde7a3c4e/supofotuj.pdf
    • https://uploads.strikinglycdn.com/files/5660a702-d9c7-435d-bd38-b5b6487ef652/zagejixidarufilalonivupa.pdf
    • https://uploads.strikinglycdn.com/files/d98ba60b-d9a6-43d9-b219-cc038d5c08b1/50255258248.pdf
    • https://uploads.strikinglycdn.com/files/d6cef364-c26e-4972-b25f-9c6ded9e16f0/30438774640.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_off0000d914.bin
101c9d96ba5cbf2e548e759060a39186be8c50344e9a9b0affc001909f2979b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 5208 bytes
font_01_sfnt_off0000eb07.bin
ccaef6c6e548b48a65bcf7aa84746e3e9898b04b08cf796c99d7d62418a05f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 10364 bytes

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