Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7551eb57f5a6b7a…

MALICIOUS

PDF

78.4 KB Created: 2021-06-09 16:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c21ba41921e942a25203fa7bc79bee04 SHA-1: ca7b46150c743c58816fec9de0e956a06c2d5e2d SHA-256: d7551eb57f5a6b7af560f4eff6d94a55150d2467b66bead46246b7e012e6ba78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF link farm'. One of the primary external URIs points to 'https://pixomot.ru/pbw?utm_term=chords+capo+chart', suggesting a phishing or traffic-generation lure. The ClamAV detection and ML classifier also strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/pbw?utm_term=chords+capo+chart
    • https://cdn-cms.f-static.net/uploads/4384149/normal_603ad23de2090.pdf
    • https://cdn-cms.f-static.net/uploads/4446374/normal_604a137b47fa9.pdf
    • https://cdn-cms.f-static.net/uploads/4387815/normal_600aa0569264b.pdf
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fca662be058e.pdf
    • https://babejogoj.weebly.com/uploads/1/3/1/8/131856270/dituw_nitetokin_damelumelol.pdf
    • https://rorefogalo.weebly.com/uploads/1/3/0/7/130776605/femuvejavo-zajevobixuti-vubagozofu.pdf
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5fe9308f0c24b.pdf
    • https://cdn-cms.f-static.net/uploads/4413475/normal_603ea4a2cbe3a.pdf
    • https://sagokawosulo.weebly.com/uploads/1/3/4/9/134904643/ripigigorol.pdf
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/144602.pdf
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5fdd06d33c7af.pdf
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/gubadatavutem.pdf
    • https://rowidonisobixi.weebly.com/uploads/1/3/4/3/134374630/kazipejemunefun.pdf
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/9274056.pdf
    • https://talinupujisen.weebly.com/uploads/1/3/4/5/134591269/junoxalaj.pdf
    • https://cdn-cms.f-static.net/uploads/4499351/normal_6067e1c3121d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fatakalewene.pbworks.com/w/file/fetch/144518034/73376725256.pdf
    • https://uploads.strikinglycdn.com/files/006e5b08-8664-49bc-9775-1be7fe3dc76b/83246021020.pdf
    • http://pewamez.pbworks.com/w/file/fetch/144897960/zogometafaxomalopovosiv.pdf
    • http://nilanom.pbworks.com/w/file/fetch/144420564/how_to_get_shimeji_on_computer.pdf
    • https://uploads.strikinglycdn.com/files/028659ae-6f70-4035-bdd5-61c274c9eec3/learning_astronomy_by_doing_astronomy_activity_10_answers.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_off0000ea4a.bin
6e373739a17fb4aab2c6db9e2ef9ac1f903ad0af9d857e2d4179d6f5937bbfde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 4668 bytes
font_01_sfnt_off0000fa31.bin
5ba0167b8fe2acc366174a8e6e78a244973a3ba6754a6e4853b4b8a0bb0cac7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 10708 bytes
font_02_sfnt_off00011eb3.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 4324 bytes

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