Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53721670959be34…

MALICIOUS

PDF

74.2 KB Created: 2021-03-16 21:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a401ef1997ba305bee0e45409275794f SHA-1: 4001aeb88d898d1237ad3d20cbbfec9c30f3c2df SHA-256: f53721670959be34143240d191a38a54a196ae352e9dbcfb75683db8dca4e600
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the overall structure point towards an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/award?keyword=acme+thread+specifications+pdf PDF link annotation
    • http://rusaleti.22web.org/una_definicin_propia_del_aprendizaje_basado_en_proyectos_abc.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/90328814895.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/68015361059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_b04929dc518c408dbf1b1e19c3a4b0c8.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_9b93536a8bc44c36a03e5e9c893a6029.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_95884d2694154b7f9f22a19964b3c1ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9687439-07c1-4481-af4d-5a88e5941d0e/62100013022.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/periodicity_chapter.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_2470a1a2823048a4a20285eb666c66f0.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_8e3ae446c4164d94be1e3a62005d6bf4.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_c976aa824d4e446d9ae652709ea00866.pdf?index=trueIn PDF document text
    • http://sadoboxijowem.myartsonline.com/zetaxepus.pdfIn PDF document text
    • http://tajapog.rf.gd/dan_brown_author_book_list.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_991f5d690d994900a3a95ca45af59dec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbdd530-34d7-448d-af6d-2b41aa1fabc1/96471825906.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 5352 bytes
SHA-256: cc56704deb19dadc563671090d5608b18195ce97563f12210947337c21f37ae0
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 11328 bytes
SHA-256: a73d51382112579e1c0c3ada606510fce3422bb573a50362773276b02eb143f0

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