Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c90b40c0157053b…

MALICIOUS

PDF

98.1 KB Created: 2021-04-01 07:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0e37b3b417d5242652c5a6cae8eb2513 SHA-1: c2fc2c8dc58dd64b326d24bcc7e9ff07e9d18e2a SHA-256: 9c90b40c0157053bace38041827ec92f1be8cac9d52cf1e41ff2d9e11ecb2c3e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'Asbab al nuzul quran pdf', intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/award?keyword=asbab+al+nuzul+quran+pdf PDF link annotation
    • http://brosbass.com/cid_moosa_songs_320kbpstdimh.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/fiamjbQ/63296340485.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/S1XUIrw/jurassic_survival_wiki_jeep.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/7297264.pdfIn PDF document text
    • https://sanulatoz.weebly.com/uploads/1/3/4/1/134131282/354645.pdfIn PDF document text
    • http://igoscandinavia.com/xamudolipuzufuzevigivudfu11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_603114b083e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_605f8516bf8c3.pdfIn PDF document text
    • https://xiriwedonup.weebly.com/uploads/1/3/4/2/134265341/sawejojurupesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5fc590e84e5cf.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/Il7QWjb/96626950756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_603e61516aee7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5ff6bda30acee.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/2ojbN0h/sleep_sounds_apple_music.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/gumirakuvetaxo.pdfIn PDF document text
    • http://vashastrahovka24.ru/mirro_pressure_cooker_22_qt_partsgo948.pdfIn PDF document text
    • http://raisinshub.pro/rujutarimajudukul2fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/when_it_changed_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/7023592438.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 5340 bytes
SHA-256: c1b2873a9b2aa7046412a2ff05bf40e960622c20e03c937ed340a89cc1cd385d
font_01_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 11464 bytes
SHA-256: 0f5a922a51fce7e962aa6e75e6a30ca85cb87b91fa8046b942adbe1835e42374
font_02_sfnt_off00015fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAC 17772 bytes
SHA-256: 1e13640776374bceeec0a11c70ef617edd00c689a7b5ab143533735a85450c1d

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