Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bcc5a77398472a…

MALICIOUS

PDF

75.2 KB Created: 2021-06-10 16:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0b50e832396f608c6acbb2905caaa7 SHA-1: c48e636c1fe473e62f4a145f867d50f7d42f7f0f SHA-256: 22bcc5a77398472a86fc5d5497ad14f9e8bb94db2bd8538c0adac193a3f5f117
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, characteristic of a link farm designed to improve search engine rankings or distribute malicious content. One prominent URL, 'https://laborke.ru/pbw?utm_term=download+autocad+2020+student+version', suggests a lure for downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/pbw?utm_term=download+autocad+2020+student+version
    • https://static.s123-cdn-static.com/uploads/4393515/normal_5fe4fac72525f.pdf
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/zezawokomasuseje.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_6018a4832f0ac.pdf
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/81de0f18d7e86d.pdf
    • https://cdn-cms.f-static.net/uploads/4407997/normal_6054d18037daf.pdf
    • https://cdn-cms.f-static.net/uploads/4407316/normal_60218ae1e5834.pdf
    • https://cdn-cms.f-static.net/uploads/4499341/normal_6061b733c76dd.pdf
    • https://static.s123-cdn-static.com/uploads/4474205/normal_5fecb839836cf.pdf
    • https://jerezuwiwufuken.weebly.com/uploads/1/3/4/3/134355676/navozubipiso.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_60256c9795d6b.pdf
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5ff97537a9b3a.pdf
    • https://tenigirexono.weebly.com/uploads/1/3/4/6/134645883/somobonen.pdf
    • https://xiruzavaxukegaf.weebly.com/uploads/1/3/5/3/135324830/zapidudamobel_maxefip_jujub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f0ac2996-769e-421b-b76c-04630d7c44c4/90337124748.pdf
    • http://zepupifob.pbworks.com/w/file/fetch/144426084/how_to_find_average_speed_in_physics.pdf
    • https://uploads.strikinglycdn.com/files/b7690798-b9d6-4188-81cf-0b404255a44b/can_acca_work_in_india.pdf
    • https://uploads.strikinglycdn.com/files/e21070c8-9cca-44dc-ae9a-4b88758fb036/87490235890.pdf
    • http://pefagisunel.pbworks.com/w/file/fetch/144487620/gta_sa_2.00_cleo_apk_lite.pdf
    • http://zekapotog.pbworks.com/f/45137448275.pdf
    • https://uploads.strikinglycdn.com/files/0a7527d8-d0bf-45f8-9864-bc86e29adb2d/91557883940.pdf
    • http://pukagij.pbworks.com/w/file/fetch/144471324/gudetama_tamagotchi_instructions_english.pdf
    • https://uploads.strikinglycdn.com/files/bbf15120-4750-4469-be23-e610a6b68e2b/stressed_out_music_video_with_lyrics_free_download.pdf
    • https://uploads.strikinglycdn.com/files/95b227a0-871b-4e7c-9a63-75e5ebdec2c9/roravuketaxopu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54f.bin
1b7aae0e9012773574dd079c500c7fc81a6f8eaba017edf727ef660fb6f2b041
pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 5360 bytes
font_01_sfnt_off0000f7b5.bin
d31d90ca9cf98580dfc17bf96d49444d15df5187491b66ca1b13088e6ed5aa61
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 11144 bytes