Malicious PDF — malware analysis report

Static analysis result for SHA-256 38423fdb0e3ad8ff…

MALICIOUS

PDF

82.2 KB Created: 2021-03-19 18:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 390c7cb328b3973b39d50e91c63d3dc8 SHA-1: 5327240f0e57cf6f84afee17d554ee062a3996ee SHA-256: 38423fdb0e3ad8ffbf975797251a51851ce9fe3c2859b0ee072e1828b9bd9f52
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links pointing to external domains, including the suspicious 'kuzutuzo.ru'. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/award?keyword=auditoria+fiscal+e+tribut%25C3%25A1ria+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fca892cc96ed.pdfIn PDF document text
    • https://goluluvofa.weebly.com/uploads/1/3/2/7/132712214/dujugegiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_5fd79f118666e.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/4864124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_6041345da4299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_6020f9d5260f8.pdfIn PDF document text
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/bamuguw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_5b89fcd13e2941de8db8833623893629.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/mamapawikokidexi.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_fa31b2d35431494dbc584ca2659ef223.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_b97401cd76994931a1fa22ed3aa8aae3.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_63a7c52b44f94633a0ad8b18766cf411.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c3abc7583a8e42b1a7c6ca60438bcefb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/zikixijes.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_097adab31e454cbe896b40782201a393.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_4e1d6343a42549498255a29174d9b280.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_44bd47d94b9944f396b1b06a3b4a29c1.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_b180b8c844b8400fa5876bad0b51ac24.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_7f30ce03216f4de0b3a08f2c9059104e.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_738885f1afbc47ffbf7f30478a4e704c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/tibubedunedelor.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/why_wont_my_harbor_breeze_fan_turn_on.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_9f86a7c7f7ec4f239271d6db1b0b5bb7.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_f2b4f6895cf5478d9b03aac38b4fce58.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 5288 bytes
SHA-256: 38c86c455f29d5f38f40cb432cacafe65a56233b7d781a8bd5c4043737c2b380
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 12852 bytes
SHA-256: 138b3243f137e4fe0d535fa5f91224e0507d2dd4d37c5a76d16f65d9be5f2ff8
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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