Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ec361603914105…

MALICIOUS

PDF

94.8 KB Created: 2021-03-28 17:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 34f554ce592285f0379be5aaaf4ff33b SHA-1: 09484fbcd33312402970576265728107c49cd36d SHA-256: a7ec361603914105e9ad3acd968c37bf771a50810554400082b829e3e9eec606
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many of which are likely part of a link farm designed for SEO manipulation or to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to lure users to potentially harmful 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://golowaki.ru/award?keyword=theileria+parva+pdf PDF link annotation
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/lupibozebe_lorugav.pdfIn PDF document text
    • https://ruxetire.weebly.com/uploads/1/3/1/3/131379726/4328439.pdfIn PDF document text
    • https://nabubane.weebly.com/uploads/1/3/6/0/136099933/toseregola.pdfIn PDF document text
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/7559352.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/kepux-nawanazo-gujos-tivakujibeta.pdfIn PDF document text
    • http://ig-mediateam.net/mrs_dalloway_quotes_septimuspxsro.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/bodubisura-xelad-kubawarasetet-gawar.pdfIn PDF document text
    • http://bathforlegs.xyz/26396803554b9hpf.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/sonutopexaramuf/sites_s_sims_2.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_8be8c1277f5b432a9c48e5aa3f632b37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14f1527-e01f-494c-bfd5-9ae2e299f00c/92579095001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e79ab0-6422-464b-8d3a-fc28404755cd/79016098546.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/priority_and_delegation_nclex_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f42b08c-e998-4c58-b1bd-7903455aadf8/the_17_indisputable_laws_of_teamwork_embrace_them_and_empower_your_team.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bce62df-c334-466c-9e48-79bc14e97d81/nizovamiberibovazozenawog.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/lukusuxaregir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d30b8c-219b-42b2-ac13-4545c69b3fd2/what_are_major_types_of_heat_transfer.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/carson-_dellosa_chemistry_worksheet_answers.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_3d59ce90fc104125bba7766767bb2d9f.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
    • 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_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 4960 bytes
SHA-256: 427ac431724311d2e63f58704d885c439db6b44968e294ca72ccd25f7184d0b5
font_01_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 11520 bytes
SHA-256: 7741233140bc66160dd090b70f1ba271d8bab811212bece646a2be800f773c04
font_02_sfnt_off00015943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15943 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330