Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a344185e1357a15…

MALICIOUS

PDF

83.6 KB Created: 2021-03-21 08:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1509e2daca0fec97b26a7b1b0910e6a0 SHA-1: 4f491d8816b47e6bd02cc9fd6cb1c53d30506262 SHA-256: 5a344185e1357a1595c2c8dfd531b85d7f76ae1e31ccb91e82236122047a017c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://vilenefex.ru/award?keyword=inland+aquaculture+engineering+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ddefb9-dd20-4545-93ad-095e6a9a4a44/kupofol.pdfIn PDF document text
    • http://pejagezuwuki.epizy.com/biopsychology_pinel_book.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/lagu_dj_bass_boosted_remix.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_e69c9fe5aba7405da0e14d488c58f482.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fe2a9a-d799-47f8-9df4-386bd0bbf6e0/94939121561.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_bfd1934b45ae4aab87c97b8b8e9f71e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2faad9a6-2d99-4873-aa2f-42deab7fd77d/kubokuresikowojewebopum.pdfIn PDF document text
    • http://pasofotamuteper.atwebpages.com/candidiasis_oral_causas.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/jopupeligipopadinewira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bb9d15-c70b-4cb7-bd43-ca1b833a05e1/percy_jackson_greek_gods_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/binocular_single_vision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535dbe81-69d0-4a86-a775-a786082cd05f/93589333217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69765d0a-fd7f-4f65-bfe0-1c6c419cc077/dell_c1765nfw_software_for_mac.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_2aa702c44b54460abaef6a675a07c956.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/143d7433-200e-46d3-a863-c47fc8b7628d/driverack_pa2_software.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/cheap_android_phones_with_great_cameras.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/jitudo.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/card_games_for_tablet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aba65ba-3170-419f-8ca0-78dcc96276c4/joxineva.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/relifesodabo.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_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 5208 bytes
SHA-256: 462e0cd2c19d22ba89779bb8118201ef57c7eda973cdfe4f9b0c52f34ebdd79b
font_01_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 10532 bytes
SHA-256: 6261d0556e1668fa8701299764a4b513d5ea11844b1d668b632b23c5d9907786

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