Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcc728cf94ebd2b…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 12:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9b2e6324ce594ccc77895a1e038b80 SHA-1: 33c26957696df2effa4142dc269c0da65daedfe2 SHA-256: 7bcc728cf94ebd2bb0d9c1c44cdd29c088fc54f123e8fcd692ab623f2b01f0a1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL `https://pelibifir.ru/strik?utm_term=element+roku+tv+issues` is likely the primary lure, directing users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=element+roku+tv+issues
    • https://cdn.sqhk.co/mikedeto/jccCib4/english_grammar_learning_online.pdf
    • https://tuxilumamiwuwuw.weebly.com/uploads/1/3/4/5/134582020/247628.pdf
    • https://cdn.sqhk.co/gidenateg/dMhdQib/53490215653.pdf
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/57969fcced22746.pdf
    • http://gadetebes.sportsontheweb.net/xavununobedamawuse.pdf
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/922550.pdf
    • http://dududuw.mypressonline.com/how_to_use_uverse_remote_to_control_tv.pdf
    • http://serururepus.scienceontheweb.net/dell_latitude_e6540_usb_ports.pdf
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/limilujomowatafukexi.pdf
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/6466260.pdf
    • https://cdn.sqhk.co/luwagoma/hhhajjB/survivalcraft_2_apk_download_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dolanuvusipegu.myartsonline.com/top_sirloin_steak_on_george_foreman_grill.pdf
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_236e8220891d40e9ba229d885b6ca3f9.pdf?index=true
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_b201f47125d1460ab0f0981224bee446.pdf?index=true
    • https://s3.amazonaws.com/fisulefajow/71406928221.pdf
    • http://vowojuxibaxo.myartsonline.com/tom_clancy_rainbow_six_siege_ps4_multiplayer_gameplay.pdf
    • http://sisufovofow.atwebpages.com/47413794887.pdf
    • https://s3.amazonaws.com/dazinibonofobi/how_much_does_a_cognitive_behavioral_therapist_make_uk.pdf
    • http://fetekovabu.onlinewebshop.net/13819424697.pdf
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_43f2753c13b54e32925657abf1741406.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62d.bin
e0c29ccb1620e99a236e44effd9846326234b6690d6547b25668a0b14e8f825f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 4584 bytes
font_01_sfnt_off000105ad.bin
ffc2c66a9476979b2380fd0ebbb41ece7406c28cdcbbc8c772f9bc7ef4aec0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 11128 bytes
font_02_sfnt_off00012c06.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 16204 bytes
font_03_sfnt_off00014134.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14134 4324 bytes

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