Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9d23967f150304…

MALICIOUS

PDF

84.6 KB Created: 2020-11-28 19:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1b9d79abe700fc1ef61a3fe761899ce0 SHA-1: de50a976bb640f3c5a0dd4ace9b11d201775dd03 SHA-256: ca9d23967f1503045a70a75de0c236631385c2dc8748eb5f0847d4394db66a0a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://trafffi.ru/strik?utm_term=how+apple%2527s+corporate+strategy+drove+high+growth PDF link annotation
    • https://zukedobawalot.weebly.com/uploads/1/3/4/5/134526307/6911565.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/9213777.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/75ccf946b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5fa04f81cead6.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/c76c3672.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/jobuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f89734354a83.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lusegokaves/melanie_laurent_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/dogevexelivokepigefav.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/lefebenabonejoxejodigute.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/38029436023.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/manual_for_ipod_shuffle_2nd_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/68109570817.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/how_to_cancel_submitted_passport_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fecd5cb-0523-4148-8f83-4ea245875b88/39268165150.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/12905547980.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e64b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE64B 14836 bytes
SHA-256: 3e190a77204dad2faabe192c627155515bbbf2ab0fda4268b9820174b0f9fd80
font_00_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 5268 bytes
SHA-256: d9a5420b357df0d705cdcb213c63b6a7ca4945e779b087c9175314cf8c1ab395
font_02_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 11400 bytes
SHA-256: c4842c9c98b59b7c288c2a7983ecc74b52be4d5157583a055c152b47e73d8898
font_03_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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