Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81c5a05fef74ebb…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 15:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 76dd82aacdcbe49ed003f970db2da808 SHA-1: 3516fb89ca2f43d0e34953e519695d9d45df9439 SHA-256: b81c5a05fef74ebb9b358310e3e530fa9d0bf2bb0980c08a841de17b804936e8
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated, but the presence of numerous external URLs indicates an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://soxebez.ru/award?keyword=boolean+algebra+calculator+project+pdf PDF link annotation
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/4108354.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/b1929bba9011.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/6469961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5ff90d3a77e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_604de91f3a54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_602d49c842bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_6056d85a610d7.pdfIn PDF document text
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/pixabatoponezuzi.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/0252c8a65218f0.pdfIn PDF document text
    • https://xomowapiwaliv.weebly.com/uploads/1/3/4/0/134000086/1e77097.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/5334250.pdfIn PDF document text
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/9494810.pdfIn PDF document text
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/wozivin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_6033c83a9d236.pdfIn PDF document text
    • https://tazivori.weebly.com/uploads/1/3/1/4/131438523/3534950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedolup.rf.gd/what_is_meant_by_the_gospel_of_peace.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_668556febac44010bb45598255516cdf.pdf?index=trueIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_8b10b1e2e65a4f14a20b1f0a517298a5.pdf?index=trueIn PDF document text
    • http://reloroxegexe.epizy.com/afro_latin_american_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/55616079567.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_2d72443cd18640dab04f9f1734aae4c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/restless_heart_songs.pdfIn PDF document text
    • http://xaligapuk.epizy.com/generals_zero_hour_reborn_full_version.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_ebcedef2efb840a998a77f35baa9ad8f.pdf?index=trueIn PDF document text
    • http://moduvodaw.epizy.com/1341402192.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 5412 bytes
SHA-256: 4784ef2486d757e352b6baf1f6f08eea0e54429411673a015276b668b6e17cb3
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 11312 bytes
SHA-256: 5e5903568c15dcb57101ab0e385ea7d69353590c9bacccf482d75822df4ced0a