Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7956c4ba60d8da…

MALICIOUS

PDF

76.8 KB Created: 2021-04-11 18:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a35947f109df3aad421b6873cfb2926 SHA-1: c076e7b1d1ea4bc7899f436213090c1749167d6b SHA-256: 0d7956c4ba60d8da6fe00620e4912e0f99959f2913dc4cd363840706f69f65e5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of embedded URLs and the nature of the link farm suggest a potential phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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/strik?utm_term=can+you+bypass+washer+lid+switch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483589/normal_604cf580cd75b.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/50763928817cxsdp.pdfIn PDF document text
    • http://apple-fruit.space/notakumusiwehm1zo.pdfIn PDF document text
    • http://spain50off.info/zeperek3e87i.pdfIn PDF document text
    • http://mynasert.online/38806700872vq89t.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/nurazadag_dumixu.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/4680471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_60481704417b8.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/4986706.pdfIn PDF document text
    • http://usacreditscore.info/sig_sauer_p229_legion_rxp_sao_e29r-9-legion-sao-rxpf8q4u.pdfIn PDF document text
    • http://prostosite.site/4366366466xwl6p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_6017381b1a3b7.pdfIn PDF document text
    • http://avtoshkola-region26.ru/58572463371ij4v2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_6056cff4b2668.pdfIn PDF document text
    • http://autobuff.xyz/simple_ping_pong_game_javascriptby8cl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_6ae7e830df39497891387cf88aab03a1.pdf?index=trueIn PDF document text
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_600d2ffd1f1749e29fdc25ba9e49e0fc.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_9035de70b61c48c6a52e7dfab34a3f32.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_4216760d6ae24ff29544c4d7ffee0c9c.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_9aec1f695db54ccd8a095ffc057d942c.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_f53846fc68a249dcb0eed08986e2c3d9.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_9f3af68e2d6a47cca5a12040926033b7.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_3a62e5bc8a5f4dafa62fa70bb3f56a4d.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_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 5400 bytes
SHA-256: b70335a97a20200fc6ae52b5e160cac3f5c6337913d9f9b0ad09dbdd555bb10b
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10740 bytes
SHA-256: e489bcc08012767bc5c9e572bcac8b3690734668881ae6628e226ea097e6541a