Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8acd1b1b2af9f23…

MALICIOUS

PDF

123.6 KB Created: 2021-05-10 08:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 81a9d4975446f51f1bbbd518d6f91558 SHA-1: 79dae63b439d0cc15da4a91f093f89ab1bbb01e5 SHA-256: d8acd1b1b2af9f237fa36111046fc73cf51975054a538f3cd626b7947fe7d1ce
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('dugedepap.ru') that is likely used for phishing or to serve a second-stage payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious infrastructure designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=ridgid+12+gallon+shop+vac+with+blower PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6021d30de670c.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/stream_of_consciousness_writing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_6004dba867ce1.pdfIn PDF document text
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/girikivonix.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/jzef_bielawski_koran.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/2379211.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/samsung_un55h6350_remote_control.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/2085859.pdfIn PDF document text
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/gaforelog_xadotewem.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/zuzufanimak.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/puroradizulizebinoxe.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/nafoxuda/wupirawaj.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/can_i_renew_my_cdl_permit_before_it_expires.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/sebi_listing_agreement_clause_49.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a82ae06-ec26-46b2-89b0-5a8f6239e466/savenujikolawadafedopix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6fc5d1-14ec-41db-b714-2d1925cb849e/zeguxezexekiwit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4656797-235f-4912-aa61-b10bb7df39c9/nelson_mandela_books_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f912a90-4c59-4b55-8d0c-c693e073d6ce/25094271322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdcc4a1-a92f-48d1-9a38-55a5fa92875d/what_does_porcelain_symbolize.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C56 5820 bytes
SHA-256: aafc0b96b5e481fac4fdd4200166dfe7212c238abe4dd67dd39304317cf63181
font_01_sfnt_off0001a033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A033 12332 bytes
SHA-256: 1aa9f848de70515bc9d585fc1ff1691704ce2bcfbf68a4b0ed7366a3a91d6ba3
font_02_sfnt_off0001ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA9C 16204 bytes
SHA-256: a109d5cc1a8599929bd7702a943337bd153faf2776ff4e30ac39a15e38c17cef

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