Malicious PDF — malware analysis report

Static analysis result for SHA-256 784fd1f07c6ef5fe…

MALICIOUS

PDF

74.9 KB Created: 2021-03-05 07:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eed1e7c40cbc2686185adf61ec475280 SHA-1: bdc70712b550646879b58333a979ccd1feb82f3e SHA-256: 784fd1f07c6ef5fef7d93db60822a8bbfbc78d1bec3b44589482b8002e1526aa
186 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of malicious intent, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=total+utility+formula PDF link annotation
    • http://sunakijabe.sportsontheweb.net/how_to_draw_and_sketch_for_absolute_beginners_free_download.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/nunovapoxasosuvawet.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/how_to_respond_to_a_good_review_at_work.pdfIn PDF document text
    • https://ruvavaru.weebly.com/uploads/1/3/0/8/130874457/8291336.pdfIn PDF document text
    • http://fruittea.space/56169461639u6nsv.pdfIn PDF document text
    • http://ejinaya.com/administrao_de_marketing_kotler_re74sa9.pdfIn PDF document text
    • http://superheatbelt.xyz/palosuwojurutpw851.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/xuzijoz-mawoxavupet-bugir-kodonojaxid.pdfIn PDF document text
    • http://rameautbxy.space/64662190847e4njg.pdfIn PDF document text
    • http://reduslim-italy.site/bikozokufedemaxujcpzsu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9207db3a5544ffd990ec6c9f627d97b.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_069f96937408459f8b9bb3e36e84bc5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/forupokisip/52199502868.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_ecf45f2758274f3fa29cff76b220aada.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_bb16a4bad51245e68d3b5a66e0a0b44e.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_9e165df057ad4380a753acd8a23466ec.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_7e0598e65f4a42c4a5c776a76136646d.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_e492d33a8faf4924baa793d4f39a0b29.pdf?index=trueIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/26127447937.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/bismillah_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/nadofupipuni.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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 4788 bytes
SHA-256: 1cfa2188096691d547ab722184757d5bb635570596d3eeab7e9247d23c551aa4
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10884 bytes
SHA-256: fef91d71812df76d6cddc1d928cf6a34e95c830ad0138e2118b2ef4a9e0b74a2