Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf93b754f63a70f5…

MALICIOUS

PDF

73.0 KB Created: 2021-03-08 01:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4664ca3b98a6ab09dd172f3d41e3a8cc SHA-1: d5ee1e66ed33bd1b9b587891fec9980b4076dc79 SHA-256: bf93b754f63a70f5555dd651d00ae03485f2807e1676b7672a9b7479dbb7fef0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded URLs and the document's structure point towards an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=stanley+fatmax+tape+measure+warranty PDF link annotation
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/kufepilalaguwilitaf.pdfIn PDF document text
    • https://lenafalem.weebly.com/uploads/1/3/4/4/134491844/vifojenoworo.pdfIn PDF document text
    • http://cleaner360.shop/humphrey_visual_field_test_interpretationnovcc.pdfIn PDF document text
    • https://xujokutiw.weebly.com/uploads/1/3/4/7/134749543/duloxok_dituduzo.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/7002478.pdfIn PDF document text
    • http://remont-kholodilnikov.website/ferofezeelw.pdfIn PDF document text
    • http://wdd13.ru/62645275866ftw65.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/4962391.pdfIn PDF document text
    • http://ihsteam.ru/rosajozolukigefemomznskl.pdfIn PDF document text
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/kudukose_labetigowagu.pdfIn PDF document text
    • http://white-x.fun/negepiselevipiroregaks4og.pdfIn PDF document text
    • http://dragonflysagewellness.com/31574590135s0626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_088293c516a149a59b57a48fd0c18ed9.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_7ee6463320b64d3d8f9a9a06eaca1c79.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_4f53509de42b466fa600e9c5a90125b9.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_3ace3f1d9cdb46c69379e76e68f96339.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/what_is_in_the_night_sky_tonight_melbourne.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/how_to_pair_microsoft_keyboard_with_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/56658127210.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_472f5ee09fba493f90261983d88c004e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 5136 bytes
SHA-256: b89c063ffdc8bb6c3dbde84f4a0fc0089b2e941e2158aff02d1a1faa8038c74f
font_01_sfnt_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 10300 bytes
SHA-256: 6f67f0adbc0d0e478b23d47bb59e6648716df6562bc82a141362d89a1904e032
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361