Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef9f674f687d245…

MALICIOUS

PDF

90.2 KB Created: 2021-02-25 19:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b03422cbd6598aa0bea1ceef1ff142d0 SHA-1: 4c39235cace5f5b92f4815286e9b819cb378d307 SHA-256: aef9f674f687d245621bee1542edbba5bd2d5f6dff7511e2a50d796987a620de
66 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to direct users to potentially harmful websites. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://leonvi.ru/wix?keyword=content+management+system+project+report PDF link annotation
    • http://cashtanks.fun/viwuko6xwrm.pdfIn PDF document text
    • http://myimperfectmomlife.com/fusosavosemibuwizedipqqrj1.pdfIn PDF document text
    • http://pipvip.ru/monthly_expense_sheet_template_excel9xtzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_6029ed63a2f23.pdfIn PDF document text
    • http://creamspait.xyz/gobuwatifajadijial9y9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6009cddf203b5.pdfIn PDF document text
    • https://rarasuxa.weebly.com/uploads/1/3/1/3/131398432/mujigakuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490929/normal_5ffc96eb21750.pdfIn PDF document text
    • http://prizinsta.online/lazosovubseirq.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/aa3cdd917a2.pdfIn PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/fipatat.pdfIn PDF document text
    • https://mivodijabid.weebly.com/uploads/1/3/4/7/134732330/bajefotemuna.pdfIn PDF document text
    • http://easy-money-cash.space/how_much_is_125_grams_in_cupsltc6i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422161/normal_5fe462d636601.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/kokia_fukurou_sheet_music58qc8.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://s3.amazonaws.com/kasuwevovog/89489507226.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/free_able_handbell_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/negidesuvolejiziso.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 5164 bytes
SHA-256: cce5fac4bcd8b9f61c80abf1fe566bf8235cfa354f39e45aa91f68678554de0b
font_01_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 10792 bytes
SHA-256: 833426a31e073f1a723c2f6572f6d2819e5e9f3190c58287f8bb557ea668fc21
font_02_sfnt_off000136e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E5 16328 bytes
SHA-256: 78493034c033d0861782d53997b784eeb14f7cecaab48b0f43681cd7da4d5e88
font_03_sfnt_off00014c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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