Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cccb5b6940d83c…

MALICIOUS

PDF

82.7 KB Created: 2021-03-21 23:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cc6b610c578869c481a0608d273b9ff9 SHA-1: 49c011a2c3ec833e0a1844ba1179eecee2e86330 SHA-256: 79cccb5b6940d83c4ba18f2ee00a5ee2488343c4fee678c8c7524998b516b66e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('midufefew.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, some on disposable hosting, suggests a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=taotronics+humidifier+owners+manual PDF link annotation
    • https://cdn.sqhk.co/vekunego/jiih3fv/30621127450.pdfIn PDF document text
    • http://kimiter.medianewsonline.com/jodasagokunaxeradurak.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/INgib9l/42818755711.pdfIn PDF document text
    • http://miketofomasofi.22web.org/niwuji.pdfIn PDF document text
    • http://nunokulivot.22web.org/94625884872.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/clOfwjd/69137572457.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/yijsleo/dinosaur_world_board_game_kickstarter.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/wghgeTK/1433286961.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/hixjcha/gerutopapesitunixopad.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/asturias_guitar_segovia.pdfIn PDF document text
    • https://cdn.sqhk.co/jumosanex/iihrHcz/rukalabufat.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/peerless_2300_transaxle_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobujosu.epizy.com/que_es_una_bacteria_coliforme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df31127-b59c-407d-9a51-0dd88582776f/how_to_write_sin_theta_in_latex.pdfIn PDF document text
    • http://lagorov.rf.gd/jimobivizenin.pdfIn PDF document text
    • http://sifuveje.rf.gd/flange_ansi_b16_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93aaa258-a735-4d72-ada8-e5330dd06970/30409187590.pdfIn PDF document text
    • http://bonizeza.epizy.com/indesign_free_template_booklet.pdfIn PDF document text
    • http://medetoti.epizy.com/lenodanumu.pdfIn PDF document text
    • http://tikatogivuso.rf.gd/bifexopa.pdfIn PDF document text
    • http://porumujowupof.epizy.com/r_bookdown_bibliography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1ce2e7-a93f-4c3b-b760-c6cc5bd0789b/swann_security_camera_settings.pdfIn PDF document text
    • http://jufomotapi.epizy.com/47932848064.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5304 bytes
SHA-256: 268b108b0fcdffefced56bfa3f10bce0d68763b0fd8b2c6d4f0ffb6a6d1b70e1
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 12268 bytes
SHA-256: 2ee40dcfe0ac7d3735eae5bf07f1fd181764aeabb3f751e2c5af821ee61e9776
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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