Malicious PDF — malware analysis report

Static analysis result for SHA-256 7892109e40d43636…

MALICIOUS

PDF

79.9 KB Created: 2021-05-02 13:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7cefb8bf4493d033d20f27b6da396f13 SHA-1: 1f16377848e10ce29a6289075d2757baeb88c595 SHA-256: 7892109e40d43636337afe13467c25760737588b408bea7d66aa71fd05ef5eba
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/strik?utm_term=fios+controller+not+changing+channels PDF link annotation
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/zudugul-penuwako-lalalojeb.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/jdgitw0/franticshipping_fanfiction_jealous.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/10950944058.pdfIn PDF document text
    • https://cdn.sqhk.co/mibazudifij/avW9wlN/spectacle_en_francais_a_new_york.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/fhajegi/simple_lemon_cake_recipe_without_buttermilk.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/hpjeii0/big_launcher_alternative.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/5jfifRP/nubijamofedakisapove.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/1507094.pdfIn PDF document text
    • https://rijokurep.weebly.com/uploads/1/3/4/3/134377239/jagipaliwe_laxikowuk_wimepetuz.pdfIn PDF document text
    • https://sadixudodexoz.weebly.com/uploads/1/3/4/2/134234615/5041288.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/acog_vbac_guidelines_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/jekejoxapifizun.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/7769088438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcabb0f2-e8f6-4ee3-83b2-0cd1ecedf1e1/on_my_honor_book_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d977f6a-3a67-4535-8166-678bba05a681/favunadizazekalukajoman.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_c8a2e5caf61a4bcba4d0f34a55697dbc.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_06c13fb2ad42499982b1661bfc3cb154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/what_is_report_writing_slideshare.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/burglary_in_nigeria.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_6e4384b6805341fb8876df448b43e9ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/ridaxevikifemezukufuzulaw.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_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 5016 bytes
SHA-256: f26a7f80e6a14c2c8b9756b9080a50da1db5dcbc7535ffe2f2c35c8613ecd601
font_01_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 10584 bytes
SHA-256: 04e1a2622b783c40412284f526a3f76ab90119dbbe9f3629539b95380501467c