Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbc68a01ecd8438…

MALICIOUS

PDF

72.0 KB Created: 2021-03-22 17:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 525fbe2b0cd0b881a37b41fd072dfd56 SHA-1: 78cc43fb6222093cc8055d37b0b6f734fa1d246c SHA-256: 7fbc68a01ecd8438cf2a0ba95075a0290ed6d96cbad5350789c150dfa221eb32
156 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 presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to direct users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=rca+2.5+cu+ft+portable+washer
    • http://ompala.store/tixosabubudaborejuvewuba4pld8.pdf
    • http://com-signto5.xyz/39759915801l2xno.pdf
    • https://static.s123-cdn-static.com/uploads/4370264/normal_5ffd4462ec51c.pdf
    • https://cdn-cms.f-static.net/uploads/4409114/normal_6052c9bd0d5c0.pdf
    • http://lollipopa.online/48699366128ltmpp.pdf
    • http://ketousa.site/xakadogopekirerawago8l67c.pdf
    • https://cdn-cms.f-static.net/uploads/4425491/normal_6052aa7f00aa7.pdf
    • https://cdn-cms.f-static.net/uploads/4446035/normal_6044a9f36a1aa.pdf
    • http://cyberghost.store/69528800464vebou.pdf
    • http://istlan.fun/972575079050pli6.pdf
    • http://reduslimitalia-oficial.site/how_to_become_a_certified_nutritionist_consultanted2us.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f32d770b-c96e-4686-93df-41983c32bf34/how_to_change_blade_circular_saw.pdf
    • https://uploads.strikinglycdn.com/files/e30bc58f-c4f9-4b39-ad31-d490c3faef3e/how_to_use_automatic_upper_arm_blood_pressure_monitor.pdf
    • https://uploads.strikinglycdn.com/files/284b13df-910c-40a8-9413-874a107ea89c/where_does_unity_download_assets.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_dd37bac07087495da2db008f2df64173.pdf?index=true
    • https://uploads.strikinglycdn.com/files/898e0366-34f2-440c-909c-380133c53670/how_much_fuel_does_an_eberspacher_heater_use.pdf
    • https://uploads.strikinglycdn.com/files/ac24aaeb-5dfa-4517-baeb-ea5c8630c075/drive_mobility_scooter_battery_box.pdf
    • https://uploads.strikinglycdn.com/files/bd8efd0b-db34-43eb-a375-cc167430574d/senolovamadofe.pdf
    • https://uploads.strikinglycdn.com/files/e13a2e70-61e3-4e14-886b-23056191d6ed/workpro_quantum_9000_headrest.pdf
    • https://uploads.strikinglycdn.com/files/d58d0f8e-f62d-46fc-8937-84344b828953/do_black_labs_have_brown_undercoat.pdf
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_a353ed3b40034f48947bd567eec3c358.pdf?index=true
    • 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_off0000d863.bin
fa776314a7cfd247fd872ccc478b2ddc4fab72a04da16a2d22a6f6581eb6fc6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 5628 bytes
font_01_sfnt_off0000eba5.bin
0c8cc0d60fc452e7b691dd666292af077bb03dc3a4fcb9d83b088ef03a7a76eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 11168 bytes

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