Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcea479b5ec225c6…

MALICIOUS

PDF

77.6 KB Created: 2021-04-27 23:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7d945b3c97839dfaf3632439bc05e9de SHA-1: 5b7168f2ad2a407a91d25d98d2b1c408b7b4b06a SHA-256: fcea479b5ec225c6e55102fe43db368b38a98b7f7174949d08d33b1c3d8e0755
186 Risk Score

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 0.9993

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://botokaw.ru/strik?utm_term=what+size+screws+to+mount+a+samsung+tv PDF link annotation
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/2996606.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/enijbuW/pic_word_game_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/x2jdjdT/gaxurajalukojexixuwegi.pdfIn PDF document text
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/sozogi-josab.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/hfTjaSL/steam_temperature_table_psi.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/hhsjjhi/2401762675.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/fzjhLjg/35101301426.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/ihggbge/kegimaso.pdfIn PDF document text
    • https://rojabufofunos.weebly.com/uploads/1/3/0/7/130776514/sukosumiparot.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/idijbgf/what_you_have_meaning_in_malayalam.pdfIn PDF document text
    • https://bujovuve.weebly.com/uploads/1/3/0/7/130738596/abd98.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/haiixhj/la_novela_teresa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_dda274bc8fb448fe9005c21f681ac5fa.pdf?index=trueIn PDF document text
    • http://rokosarod.rf.gd/favelofuloveze.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_084b18ee0af04634b570621059977973.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_b5f60fca79004f81b8d1aca5bf12a395.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_b902629ca3814110af9ad43715e4e44f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/freight_quote_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/world_news_report_college_rankings_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/adobe_air_for_android_2._3.pdfIn PDF document text
    • http://dosekidonara.epizy.com/letter_before_action_template_unpaid_invoice_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/kefuvopexuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/wolagisodinujixobururag.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5396 bytes
SHA-256: ed5b9b4c873e35c7200bfcf1b2545d7970a5788481807ca23602d7f7c76d843c
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 10752 bytes
SHA-256: ada8b2d985ccf007201260db98b5273ea9b16d53507ec75048c5702870ea1a31