Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d3e3e5f0094974…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 06:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5854c6b834965f5d427a968b5f22178 SHA-1: bb70ba424e7a36a6c3f1e9524711488feb4e1695 SHA-256: 09d3e3e5f00949748055f3d201df274735e3d58880fa27590a8f226f7c1667c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with a critical heuristic identifying it as a PDF link farm. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs, such as zajinet.ru and copalofa.site, are likely used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=articles+of+confederation+worksheet+high+school
    • http://copalofa.site/84048622583exe3c.pdf
    • http://shopbest.online/what_is_the_meaning_of_the_word_etymology_as_it_is_used_in_this_audioqxufe.pdf
    • https://cdn.sqhk.co/nalujujoso/9id3PPu/wegilowagolokepejufogane.pdf
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/7116698.pdf
    • http://sovetnik53.ru/69020028332e4lc9.pdf
    • https://cdn.sqhk.co/jimavidozeze/jcHDgiD/text_twist_2_free_no_download.pdf
    • https://cdn.sqhk.co/voravaxa/Phaifgf/kitadej.pdf
    • https://cdn.sqhk.co/tatidukigag/bP3rHgh/halloween_chocolate_covered_strawberries_near_me.pdf
    • https://cdn.sqhk.co/fuvebopeweb/aLhfhfA/13712815877.pdf
    • https://fikifiwokadekaw.weebly.com/uploads/1/3/4/5/134585034/pavowedamukuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tirimofufemukat/87090276033.pdf
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_d813cd72600a4258804c7609c50dab51.pdf?index=true
    • https://s3.amazonaws.com/zesotat/75739612663.pdf
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_82a98072d3b647469f3ab0d081735829.pdf?index=true
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_957455334edb4632af93b682484c8063.pdf?index=true
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_5c184df2e48548a096c6648767805d70.pdf?index=true
    • https://s3.amazonaws.com/damerirazib/1879904354.pdf
    • https://s3.amazonaws.com/rawesaragegugar/new_software_for_iphone_6.pdf
    • https://s3.amazonaws.com/bidemewufa/83375439556.pdf
    • https://s3.amazonaws.com/lopeteb/54765546726.pdf
    • https://s3.amazonaws.com/vuforewebub/lamisadazofifuriziwozi.pdf
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_2576c78040c5435ca81ea9bbc62a9353.pdf?index=true
    • https://s3.amazonaws.com/memexelu/the_little_prince_opera_synopsis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd0.bin
c8644d01b1a82d682b3ebe25ba59dd5645ccea8c6d209c5c0b13244970e809ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 5428 bytes
font_01_sfnt_off0000ff54.bin
058d475b568a67b5cf0a079d1a742d2c7a975a8c1ec695c3920b17ca63ea40c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10776 bytes

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