Malicious PDF — malware analysis report

Static analysis result for SHA-256 490985c0a449acda…

MALICIOUS

PDF

78.7 KB Created: 2021-03-29 13:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: db3938b380d4caf549fe4948185e1e4b SHA-1: 9d3f62fa1e6d2571726ae9af0b27e5e40270984c SHA-256: 490985c0a449acda2ca8b22e13d8c030b83b2c53ae682d78d28da54f4bbefd18
186 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. One of the primary URLs, https://kuzutuzo.ru/strik?utm_term=skin+so+soft+lotion+uses, suggests a potential phishing lure related to product information. Although no scripts were explicitly extracted, the PDF structure and the heuristic firings indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=skin+so+soft+lotion+uses PDF link annotation
    • http://freshnatur.fun/tuliluvavivazivops6xv1.pdfIn PDF document text
    • http://nakrutkavk.site/hide_application_hide_app_hide_iconmkm1m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468827/normal_5fc6435045e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_605bb1c48cb1b.pdfIn PDF document text
    • http://rezltml.xyz/where_to_donate_clothes_during_covid_minneapolisnm7g1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5fe7722d5862d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453338/normal_5fdf1a1bc7b81.pdfIn PDF document text
    • http://pelistens.xyz/98386067379yxm0g.pdfIn PDF document text
    • http://testersairf.xyz/mebifupaturavekewujobofydvu4.pdfIn PDF document text
    • http://domastmsk.space/balance_sheet_current_ratio_calculatorcnxo5.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/5030563.pdfIn PDF document text
    • http://notdull-eng.online/argumentative_essay_format_collegegepjs.pdfIn PDF document text
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/43bc90d48.pdfIn PDF document text
    • http://momentikshop.space/manual_de_funciones_senativu9w2.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/wejifuf.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/529cb3d1197.pdfIn PDF document text
    • http://lazadacostumercenter.com/classifying_real_numbers_mystery_pattern_answer_sheet0x48o.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/lopejatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_131bf417a8bc4b06889ddd45c4674589.pdf?index=trueIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_882276bd20bf42f2b4ba10872a80533b.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_f4558d7a3b5d43cf9c111d5327ee8205.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_d63c5a482529420c9563a24555ac19b7.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_8e4da9c7af0144e7b066dff7de314c36.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_c2d088ed75a54ed992c14c25b6f5acef.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 4624 bytes
SHA-256: a31efe9ebc01701bc68be2a12305e8cafcf4231dbb090d6b60e89eced694848e
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 10896 bytes
SHA-256: 232530fc29df9b86da70af7478d90dd125014754a8c08e7c6060c5248aa1aba6

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