Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3faeb8615a33b8…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 11:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2e7eadd5e0576b25677a9d0d4f0c4a17 SHA-1: 9efebc20abb8e44d36bb176b0fe4a71f8e288ad2 SHA-256: 8f3faeb8615a33b8b644242bcc294682bf39166dafdde890a4914e72f677c6eb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://maypoin.ru/wix?keyword=balancing+equations+worksheet+2+answer+key+chemfiesta', is presented as a 'balancing equations worksheet answer key' to lure users. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=balancing+equations+worksheet+2+answer+key+chemfiesta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453118/normal_602873f4a2fda.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/ligixibugolexom.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/7030412.pdfIn PDF document text
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/d5aedc4c93b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5fea0bea8585b.pdfIn PDF document text
    • https://novadoja.weebly.com/uploads/1/3/4/8/134873208/3114759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fd27b4db0c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_60333110f1c11.pdfIn PDF document text
    • https://mifabawir.weebly.com/uploads/1/3/0/7/130776047/4789224.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_f772af949a834d6f8203fff461f55237.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_b4e750e8d5f64ad580753ded8c2835d0.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_25eb17cefac24c03aa34e51c37738e80.pdf?index=trueIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_8634e604fe724f2cb54b535e43b89497.pdf?index=trueIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_f2caea458630473baf749cad8afc370f.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_3c7b3366db7b4cc991c3a15095b4e2a6.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_11b83d481491488ab2d673a9011a75dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/wubupijas.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/kapijowe.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/algorithme_informatique_1ere_anne.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_224a047c77794159a39e1b376826f60d.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_4a185a981be74af98b6fec333f8dca50.pdf?index=trueIn 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_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 5860 bytes
SHA-256: 1a9d12f6a9a91e3348ae146b5dcc9365a5ab59b7bd554530320584d2c1d4a0eb
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 10944 bytes
SHA-256: 52f8e41607cc35c58b2d1c52e846cb955e9f166228f79070b4c6220e51d43d1d