Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67af11dbbcc5bd4…

MALICIOUS

PDF

72.2 KB Created: 2021-06-02 02:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e8479fe5985da46dc955f8e82fffac6a SHA-1: 1166171a6c1a26c36fb1473e5b7701fd1d44710b SHA-256: d67af11dbbcc5bd4bb2fe9e5f44191143b56c5b89614bd40753870c431c8b867
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of numerous external URIs and the link farm heuristic point towards an attempt to direct users to potentially harmful content.

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/123?utm_term=goulds+well+pump+guide PDF link annotation
    • https://jamaxukupabidi.weebly.com/uploads/1/3/4/6/134675967/worodulitavefaj.pdfIn PDF document text
    • https://ramojiri.weebly.com/uploads/1/3/4/4/134443871/0b2367.pdfIn PDF document text
    • https://lonojoxojiliw.weebly.com/uploads/1/3/1/4/131438577/5988177.pdfIn PDF document text
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/b92f617922.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/7c9f005add5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_605f9a8897ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_60543ad61b3ea.pdfIn PDF document text
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/gozafokafomi-lojeduxonegaban-zisivobezu-bepatirarejuv.pdfIn PDF document text
    • https://jutisopi.weebly.com/uploads/1/3/4/7/134775863/320813.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/dowatibafuwewibegiwi.pdfIn PDF document text
    • https://sujosajuzatitoz.weebly.com/uploads/1/3/5/3/135312362/4626188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ff324e-9535-40ef-b3d1-254c1e9ebb20/59587162234.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/bexojalikesuletisog.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/pdf_roll_of_thunder_hear_my_cry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c33218-1fde-4a78-bc5e-b28c517b5b22/jurilodupotonisowu.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/short_book_review_of_treasure_island.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8360c7a4-d24d-454e-8669-d53c4ab6a535/does_injustice_2_legendary_edition_have_all_dlc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c519db9c-ec72-4342-9898-61983ccc9b8d/sopa_de_letras_de_numeros_enteros_para_imprimir.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/ghazwa_e_khyber_in_urdu.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/duval_county_school_police_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a49923-2889-47e9-a82a-113232d1ff37/3497626811.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_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 5096 bytes
SHA-256: 349cd83ebc2f12969dd47151e7ce8d33ea7b37f8fc0eb7d3bae621182b211721
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 10280 bytes
SHA-256: 14513875ac217e38ed871aa07b24946d3c06f7f8f20d0b3293622b7869f1ad18