Malicious PDF — malware analysis report

Static analysis result for SHA-256 defa703702c561b7…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 06:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da882b1bd85b2c6589381a789b787b2 SHA-1: b57cfdc0551b03266b9a407c86de9bad0b47b16b SHA-256: defa703702c561b7e4968c15c05bfb97b77ea8f2005b7024656c949b0bc1c05e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to English grammar, likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=verbos+en+ingles+en+pasado+simple+interrogativo
    • http://24goodstore.site/blockchain_dns_firefox_androidho4g0.pdf
    • http://probmaka.tech/69443262163vc19c.pdf
    • https://jadamoxor.weebly.com/uploads/1/3/5/3/135344742/a8a5a4.pdf
    • https://golewobewawir.weebly.com/uploads/1/3/4/3/134350879/tewezezuv.pdf
    • http://austritkfa.com/free_stickers_for_facebook_messenger8g83l.pdf
    • https://boxakowomer.weebly.com/uploads/1/3/0/8/130874011/9534968.pdf
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/6240057.pdf
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/wefajofisodi-kominapepozud-foburolesuji-kajevopebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_cd5ccc2cd0c4445aa453adaa3c229349.pdf?index=true
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_0eecce75dd834c1d9a019211df21b5eb.pdf?index=true
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_112c107699304f93ab2083ac09354daf.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_4f928ad416374790a0651c95360bbcba.pdf?index=true
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_ee216e8807204573b37a11d397a0c1b4.pdf?index=true
    • https://s3.amazonaws.com/woneketelak/ruxeninapi.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_a2d2b44ee4794bd09e55e3ab06805a1e.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_f3dc193ef5fa44f3809096dce6fbb37d.pdf?index=true
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_2b54b4cb5deb48adb03065a8f973f226.pdf?index=true
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_44e88998c4bc4b3d86eb1cd7432b91b3.pdf?index=true
    • https://s3.amazonaws.com/wixatax/magnum_inverter_remote_troubleshooting.pdf
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_d48f7e6563f8422aa8c611fff470d05e.pdf?index=true
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_ab405b1559374a94aeab879f8ede06ed.pdf?index=true
    • 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_off0000eba6.bin
ab64750812719ee70a7b26eda96ad0c31536cbb275299de6c97797ceff37c8d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5444 bytes
font_01_sfnt_off0000fe14.bin
82a058c8946a7778754f12c69f8fd37c9218d554abf38742bf51d5180b4e5cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 12676 bytes

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