Malicious PDF — malware analysis report

Static analysis result for SHA-256 100e482675de7fc0…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 16:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5394319105bf2ebe6f318f49293b42a9 SHA-1: 119d83d55718c597e658240224f391bfef82378d SHA-256: 100e482675de7fc0504c92807a246614a4f35079e4bd11ec3d25752f2147829d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=toca+house+apk+mod PDF link annotation
    • https://cdn.sqhk.co/xolofiwano/ijjaUyy/20_likes_on_instagram_free_trial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_601edf6243ada.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/egcTjgx/32814142062.pdfIn PDF document text
    • https://cdn.sqhk.co/vozedolurezu/gitwjio/88665021027.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/computer_ki_define.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_602466a7eb552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_6001e35086ab9.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jdhdhdo/ruponideginugiguderufaw.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/in8igif/future_pinball_space_invaders.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/kexekunumuwozaruba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9788b992-890a-4c8d-98f9-8819e7ee77d3/what_does_light_absorb_mean.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_f9bc39d9beef47929722cdf1d1fa8e48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a0aaae-8b5d-4bc7-bb3f-b866208e308d/kopemuludukibanuwumejaxuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93285c8-ac73-4fd5-abff-66448db56eeb/2011_chevy_traverse_alternator_problems.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_17c1496ab2c3421086a1e8c37a1a9304.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad05214c-6918-4666-b075-d7bd401d4fed/togifufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b982dc65-194a-4049-8f3e-6c9a8e1e133f/44523801008.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_97266f41d72f4cfda1938353ced42f09.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_c4255a66cd1f49c294512eccb675c85c.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_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 5200 bytes
SHA-256: 16653c84f1c7dafeb2b775ac6a8ac6055b85c734215d4bcb1b2a8026c0701b15
font_01_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 12064 bytes
SHA-256: 6a68840b239c946e9cd7b40e56668f97e7a06352a51dc6df8fa86f6dfe267576