Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6c51354699754e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-09 01:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38fa840404fb081b9e1ee87ddf6eb35a SHA-1: 7c9688802b2f2e9c6a0759cad61c497ab0fb825e SHA-256: 9a6c51354699754e0a080a4412aa2b00b795878ea218f7c37160774a5bfd9869
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure for an "action verbs pdf worksheet", likely intended to trick users into clicking on the embedded malicious URLs.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=action+verbs+pdf+worksheet
    • https://cdn-cms.f-static.net/uploads/4446390/normal_600d5080c9d62.pdf
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5fcb3238d9f1c.pdf
    • http://vuwagumewaga.iblogger.org/25710741555.pdf
    • https://cdn-cms.f-static.net/uploads/4424347/normal_602be950159c8.pdf
    • http://lukegerit.22web.org/how_to_say_due_date_in_spanish.pdf
    • https://cdn-cms.f-static.net/uploads/4391898/normal_603ef576d4ab1.pdf
    • https://cdn-cms.f-static.net/uploads/4414677/normal_603bfd7665ae1.pdf
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5ff666772afe3.pdf
    • https://cdn-cms.f-static.net/uploads/4405186/normal_6046623b420b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pizivurapab/ruger_lcp_2_22lr_owb_holster.pdf
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_5542f61d874e4c1eb863089811dbbd68.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_d4ec8ee1f0a040e1a4ea904f09f60d1a.pdf?index=true
    • http://dixuzudes.epizy.com/84381939296.pdf
    • https://s3.amazonaws.com/muwomapotumugi/86304470621.pdf
    • http://roraxekabitapoz.rf.gd/compulsion_2016_parents_guide.pdf
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_34ed5a54a39a4ec18a47d3e6bfdc4842.pdf?index=true
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_ab32def3f4be4aac8d743710f02dd77e.pdf?index=true
    • https://s3.amazonaws.com/rorives/chadariya_song_from_badlapur_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bb.bin
fb8dbedac4c8cc1040f6e7fee3922788ca84c0e9474755f82f171ebfabf9d796		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 5132 bytes
font_01_sfnt_off0000eb2f.bin
38040994a0d863544e0fee37ac847dc7a75a219f5630f096a61c5e61ab03bf99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 11216 bytes
font_02_sfnt_off000110af.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 4324 bytes

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