Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b80439af7fb0df…

MALICIOUS

PDF

79.3 KB Created: 2021-04-10 13:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a721588c7b8420d205d4c33b60dbaa6 SHA-1: b00d4750231dfb76b9701b0232c333011f6192a5 SHA-256: 34b80439af7fb0df8112a85f113a82aba0c4576931285c3ac24d7163fbb5026e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a high number of external links, many of which are embedded within the document body, suggesting a link farm or phishing attempt. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document attempts to trick users into believing there are new or changed bank instructions, a common tactic in business email compromise attacks. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://xajibur.ru/strik?utm_term=plantronics+cs55+bluetooth+pairing PDF link annotation
    • http://baranaydin.org/codeblocks_shortcutsuww85.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/4836871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5ff967595a22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_60560649617ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425919/normal_5fcf17539cfef.pdfIn PDF document text
    • http://idealica-italy.site/8939475289222af6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_604161b100211.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/5415146.pdfIn PDF document text
    • http://copyrights-notices-helps.com/lonedotozujhww4.pdfIn PDF document text
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/02a9f78e133f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_60100efa8b076.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/f9521446889.pdfIn PDF document text
    • http://stickerrus.ru/manualidades_con_tubos_papel_higienico_navidadbtz36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/jeduguxaka.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/sodium_in_taco_bell_taco_sauce.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/rogefulofoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/nipirejutidakewerasuse.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/91653709983.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/ti_30xs_multiview_calculator_online_use.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/73840350881.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/83407234972.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/how_many_cards_in_a_deck_plus_jokers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 5460 bytes
SHA-256: 88be156f93d718b774a83f4af5b96a10c7bc0c1f1120f761ff93a78d55669fa5
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10868 bytes
SHA-256: ffc61ac40d35c2f78ded5e7cb0854e96f915955518d6177eebdd831e1daa5fe6

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