Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a39b9e5b76e2acd…

MALICIOUS

PDF

76.2 KB Created: 2021-05-20 09:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27aa4c5c3f56cfe2b1902fe474182a97 SHA-1: 8983102b576c6afac71a6e17932da12672e91c4f SHA-256: 2a39b9e5b76e2acd93c862e9a2fe4b52b804c4939b8d86c3679f887bb12aac32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary one pointing to a URL that appears to be part of a link farm. The document body is heavily obfuscated and contains what seems to be metadata related to PDF generation, but no clear user-facing content. The presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

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-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://nipisod.ru/strik?utm_term=parting+glass+sheet+music+pdf
    • https://zunazodofi.weebly.com/uploads/1/3/4/6/134636935/8423548.pdf
    • https://cdn-cms.f-static.net/uploads/4498994/normal_6068e24ea70c8.pdf
    • https://cdn-cms.f-static.net/uploads/4480155/normal_6031746bacb16.pdf
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/nagisaro_joraxej_figagaruwoxoges.pdf
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/wewudenosudute.pdf
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/kigumaxem.pdf
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/woginu.pdf
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/84f9071.pdf
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/3851060.pdf
    • https://cdn-cms.f-static.net/uploads/4470020/normal_6039f0d15181e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d85893fa-03a1-474c-b8f6-22c87f6146e4/vuwejusupoxoxepifudap.pdf
    • https://s3.amazonaws.com/vudivuzakal/xogizevakisere.pdf
    • https://uploads.strikinglycdn.com/files/ff9fb8a9-6c51-4048-9719-349fb5d6d0eb/troubleshoot_atwood_hot_water_heater.pdf
    • https://s3.amazonaws.com/dopugaxelelema/porter_cable_compressor_regulator_repair.pdf
    • https://uploads.strikinglycdn.com/files/85bad492-0e95-48f0-bf3e-5fdf1f044826/1296716081.pdf
    • https://uploads.strikinglycdn.com/files/3b26824d-3d93-4df1-a9b2-48c62ec99e01/what_is_meant_by_self_reliant.pdf
    • https://s3.amazonaws.com/fajujiju/gomidilujoguzovufe.pdf
    • https://s3.amazonaws.com/gezetega/citizen_eco_drive_skyhawk_user_manual.pdf
    • https://s3.amazonaws.com/setikizo/how_to_pray_greek_gods.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/jennifer_lopez_ain_t_your_mama_song.pdf
    • https://s3.amazonaws.com/bubeto/sulifakix.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_off0000eccc.bin
84ef5ee295ac4243b6b7086c71f6b4540e51b14fdd14524e87e7e2d89867f116		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 5568 bytes
font_01_sfnt_off0000ff92.bin
a2975b16da7d759b57adb4c8c48221d742f71ea18759952a8acd5ddd5d6f6715		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10600 bytes

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