Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4992a6362318ed8…

MALICIOUS

PDF

144.8 KB Created: 2021-04-08 08:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ff2ff24416c4f5ffe43cd0bddd7ce4 SHA-1: fd2b66722870663967237364cf397f8d3695977f SHA-256: b4992a6362318ed8cca53672691a8bae9da198042cbae3d04068ae6593e71c24
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to 'midufefew.ru', suggests a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and external link farm are indicative of a malicious document designed to deceive users, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://midufefew.ru/wix?keyword=yoga+manual+pdf+in+hindi
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/volimijuba-tusalameb-xonez.pdf
    • http://kexedeziferu.sportsontheweb.net/duzagizixewusurufap.pdf
    • https://mivixotagu.weebly.com/uploads/1/3/1/3/131384173/buxunisajinepudik.pdf
    • https://jowiroluka.weebly.com/uploads/1/3/4/3/134336896/4606033.pdf
    • http://xeberul.mywebcommunity.org/5085964110.pdf
    • http://wejowadizabudex.mypressonline.com/mental_endurance_synonym.pdf
    • https://guzoxufogoxuwo.weebly.com/uploads/1/3/4/0/134097696/vubati.pdf
    • http://nosumiva.mywebcommunity.org/cariama_cristata.pdf
    • http://duzixofiwisegi.mygamesonline.org/bugigubikininuvetav.pdf
    • http://vufajed.getenjoyment.net/39146050879.pdf
    • http://potuxoposutu.medianewsonline.com/befexalam.pdf
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/79a25224154d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/muxozuvalubi/how_to_make_a_castling_move_in_chess.pdf
    • https://s3.amazonaws.com/xuvamuba/can_you_notarize_for_family.pdf
    • http://peruroz.onlinewebshop.net/input_type_file_preview.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/bernie_madoff_scandal_summary.pdf
    • https://s3.amazonaws.com/vexeliku/whirlpool_washer_manual_model_wtw5000dw1.pdf
    • http://gixarewujedel.atwebpages.com/learn_basic_arabic_language.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/how_to_cut_stone_by_hand.pdf
    • https://s3.amazonaws.com/kelageketisefuv/buxidutuvaxesapurubizimex.pdf
    • http://bumejefivoxigo.myartsonline.com/rubaduwegorelesiwidopi.pdf
    • https://s3.amazonaws.com/zosevid/52073382462.pdf
    • https://s3.amazonaws.com/fosalizuzu/54681173943.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_off0001ea3c.bin
10d9846cfa14a0202036a9fede4510129b5170129193854de22dcd4d74b186e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA3C 5144 bytes
font_01_sfnt_off0001fb9e.bin
aa6b49f0bd788ded58fdc604a396e089e1c6a4656692a34f2a39050d5941afd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB9E 14932 bytes
font_02_sfnt_off00022748.bin
f8f0d37934a5a1105974e7a32705e48374ff58cb54bb8714fcb70f5997aeb8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22748 3620 bytes

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