Malicious PDF — malware analysis report

Static analysis result for SHA-256 4824e57d923e9185…

MALICIOUS

PDF

90.3 KB Created: 2021-04-06 23:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 87ea04cb31a8707aa9a6f5dc6d28b689 SHA-1: 9fb300770d1ca84bafea41b23ad67ab011ad58af SHA-256: 4824e57d923e9185e21d44654251d210606ed61f93535dbc188ac39d4c1613d1
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 hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were extracted, the presence of embedded URLs and the heuristic firings suggest the document's primary purpose is to redirect users to malicious or spammy websites.

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://jumiwimov.ru/wb?keyword=husqvarna%20128ld%20recoil%20spring PDF link annotation
    • https://cdn.sqhk.co/buzovegom/AfbibqL/67329500770.pdfIn PDF document text
    • https://cdn.sqhk.co/vizefejij/xhijbic/53031838807.pdfIn PDF document text
    • http://wonodeme.22web.org/complex_sentence_practice.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/rodudi-fuxubot.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/hjebijm/worldcraft_block_craft_mini_world_3d.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/3def4486aecfc.pdfIn PDF document text
    • https://cdn.sqhk.co/lovaxixifew/dn9acgc/54078193260.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/jppOhfN/nuxokuxuropa.pdfIn PDF document text
    • http://dutipajito.22web.org/what_are_the_books_of_percy_jackson.pdfIn PDF document text
    • https://cdn.sqhk.co/gabironero/hi2JGbK/77561367687.pdfIn PDF document text
    • http://magonimiw.iblogger.org/principles_of_bhakti_movement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubunixa.epizy.com/5365418909.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_0b80811b46b9413e824ed47b4c075c28.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ad2bc9f3ad0e4e8396d1f09c6b4f4841.pdf?index=trueIn PDF document text
    • http://sawezigulafufa.epizy.com/xasodogodefirawatum.pdfIn PDF document text
    • http://domusas.rf.gd/programme_musculation_prise_de_masse_pour_ectomorphe.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_5622c59618bb4d76b00deb1929171fc8.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_0ff442ea9fed4352b85c6d2539e082ac.pdf?index=trueIn PDF document text
    • http://zexelebisitod.epizy.com/50541992506.pdfIn PDF document text
    • http://kulaxukiju.epizy.com/smok_alien_beginner_guide.pdfIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_34af878b03c446cb854a91d4d6bc5d31.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_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 5764 bytes
SHA-256: 011b136b495ba5535e05fe577fac6769b71c65fc6ba1f21a4cae62d4f1c6e855
font_01_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 13116 bytes
SHA-256: 16f377efcb7505d986240db56d72c7eba6d8dd1e03b8d1ca4d6588768c72d55c

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