Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cb9e0ea5ff344b…

MALICIOUS

PDF

88.9 KB Created: 2021-03-23 12:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6fa8a9c585a67d00c89d8f6ece5d702a SHA-1: 139ae0fa8902e9adef3aecd52717245a2d3701a9 SHA-256: 23cb9e0ea5ff344bf784279808b41268e1a21d21fc75fd9eb0e4a792f35be96a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary function appearing to be directing users to potentially harmful content or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lead users away from the document to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/wix?keyword=linear+relations+and+functions+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493545/normal_5fdaebd991253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_602906d835e41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5fe59bccdd895.pdfIn PDF document text
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/7780396.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/Iljd0ic/kiki_layne_parents.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/Fjbjh7E/2850276876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_6015397033ef3.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/mBmibie/stress_control_norbu_game_breathing_black_friday_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/ZmiU3GW/apple_sport_watch_bands_series_5.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/1b9ef23e8c6da25.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/jhShhib/can_you_escape_the_room_7_level_36.pdfIn PDF document text
    • https://votuxujalesobe.weebly.com/uploads/1/3/4/6/134683371/dujazav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_600b1f4ac6014.pdfIn PDF document text
    • https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/sixaxileroku-fikeb-kobokigujafoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_603ee55368d82.pdfIn PDF document text
    • https://voganesabif.weebly.com/uploads/1/3/1/1/131163538/xozumavalira.pdfIn PDF document text
    • https://xokewetabido.weebly.com/uploads/1/3/1/8/131857041/rapezopekotap_tevisu.pdfIn PDF document text
    • https://xonodomewavewa.weebly.com/uploads/1/3/5/3/135316089/baxibejidafu_guvolanogi_muzisoz_nabinesozumuxa.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/091b076b6fea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_117f2537dba941adabffa390b5de22a5.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_210ea348a8b749eba13d339d7c462bd8.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_1f2fb5531b5941f0a94815828b109c4a.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_24b714b8156d498e8782f3ea68f61c94.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_5b53beed545247a6a238b09ec0197e59.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_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 5216 bytes
SHA-256: 0890dc70c16f4d721a3f26605186b277e2865e5011521b60bbd99e58f968d936
font_01_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 11136 bytes
SHA-256: b2c1ce629b12c9cbd700fdf88fb1fcd008737534fbcedc839d9a2df9f9edf3ef

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