Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf1c70164ac7932…

MALICIOUS

PDF

83.8 KB Created: 2021-06-12 17:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166ca0b1b7a7c0178f51c2cac71670be SHA-1: 664b9794c3893ef43393be9b3c14530000eb5cf7 SHA-256: ddf1c70164ac793269049601692b7fad6a53abcca0a8d13805c28962b280118c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or redirection mechanism to distribute malicious content. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, but the primary malicious activity appears to be the mass of external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/pbw?utm_term=senorita+mp3+naa+songs+download
    • https://lufojegixibebaz.weebly.com/uploads/1/3/1/4/131407324/400071.pdf
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/3445176.pdf
    • https://static.s123-cdn-static.com/uploads/4387233/normal_5ffb35cade363.pdf
    • https://mikodetakono.weebly.com/uploads/1/3/4/4/134497144/jedafesab-fadaxu-tifebagubakukat.pdf
    • https://wubuzafovotul.weebly.com/uploads/1/3/0/8/130814439/vekijujiki-nisivukixajuluk-bazaxagizagu.pdf
    • https://cdn-cms.f-static.net/uploads/4416150/normal_6043740833533.pdf
    • https://gewivobom.weebly.com/uploads/1/3/4/6/134643535/bokimizotup-libus.pdf
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/52c63bb7f.pdf
    • https://felefufo.weebly.com/uploads/1/3/4/7/134768155/8304acaf9fc153.pdf
    • https://tuzitumup.weebly.com/uploads/1/3/4/3/134385826/7371ae2424bc.pdf
    • https://cdn-cms.f-static.net/uploads/4486199/normal_5fd8dc7ad6036.pdf
    • https://static.s123-cdn-static.com/uploads/4428033/normal_6003b36257d91.pdf
    • https://cdn-cms.f-static.net/uploads/4491155/normal_60460aa943ce5.pdf
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/runefotirokulikum.pdf
    • https://cdn-cms.f-static.net/uploads/4402501/normal_60364c51083f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bb00a31d-962c-4b92-94c5-1b131fe43648/tepinov.pdf
    • https://uploads.strikinglycdn.com/files/9f0da7f2-9906-467c-b6dd-02c88236cbf1/ti-82_ti-83_difference.pdf
    • https://uploads.strikinglycdn.com/files/2e6ba87f-d210-418e-8125-c69c7bca1798/fazopu.pdf
    • https://uploads.strikinglycdn.com/files/39fb2791-c8a7-4dbf-bfdf-c4896cf9be47/how_many_episodes_in_umbrella_academy_comics_are_there.pdf
    • https://uploads.strikinglycdn.com/files/07e1707e-3423-4e09-a883-6c154790db1d/diya_aur_baati_hum_serial_episode_15.pdf
    • https://uploads.strikinglycdn.com/files/40658ed3-cc10-40db-b46b-ae335680394c/32061785053.pdf
    • https://uploads.strikinglycdn.com/files/1494dec7-a753-4196-9b63-2760f03c4439/lekumutedomogosu.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_off0000fc6a.bin
c6076b721528a471e7c5bcfe216b6e743273c90c2a7adce29ce5e3fdd07559bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 5428 bytes
font_01_sfnt_off00010eca.bin
782164edfc98899ff791529eb609f7892d0d4385b247d173b7d1fea607665ae5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 10724 bytes
font_02_sfnt_off00013388.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 4324 bytes