Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d7e4638abb3bad…

MALICIOUS

PDF

76.6 KB Created: 2021-03-24 13:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0640c7a2ed45c8d89d0985e0c80455d6 SHA-1: 528b50e7ba2c83eb0fc6b5dd81f542c4d05d8a31 SHA-256: c5d7e4638abb3baded82dac97e5243157ba648484d5250add4d21c6c47481e5a
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 0.9997

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://kuzutuzo.ru/award?keyword=anemia+hemolitik+mikroangiopati+pdf PDF link annotation
    • https://damatabawapu.weebly.com/uploads/1/3/1/3/131379320/nogokiw_dojovasoni.pdfIn PDF document text
    • https://sivoroxusakigob.weebly.com/uploads/1/3/1/4/131453081/1633658.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/calendar_2020_november_printable.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/mass_effect_andromeda_official_strategy_guide.pdfIn PDF document text
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/somosefix_bifejode.pdfIn PDF document text
    • http://zebisol.mypressonline.com/99847946710.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/8213827.pdfIn PDF document text
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/1755974.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/is_there_a_live_chat_for_facebook_help.pdfIn PDF document text
    • https://rivoliga.weebly.com/uploads/1/3/5/3/135311175/fivog_pufoji_buxomijonawipu_fesojif.pdfIn PDF document text
    • https://ropedali.weebly.com/uploads/1/3/0/9/130969406/6da96f2b7569a.pdfIn PDF document text
    • http://kupivse.xyz/walking_disaster_book_onlinecryuh.pdfIn PDF document text
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/f1501c.pdfIn PDF document text
    • http://imkl-checker.com/which_is_the_best_echo_show_to_get12ovl.pdfIn PDF document text
    • http://physcoo.com/compagnie_financiere_tradition_annual_report_2017g17ww.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/sunset_beach_quotes_instagram.pdfIn PDF document text
    • http://sefokirof.onlinewebshop.net/algebra_word_problems_worksheets.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/6th_grade_order_of_operations_worksheets.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/radical_love_victory_worship_chords.pdfIn PDF document text
    • http://mizetum.onlinewebshop.net/broken_vessels_amazing_grace_sheet_music.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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 5332 bytes
SHA-256: d6f17377712d84ff65bd85c6a728d137190fcf1d3a1439fc6e7331cf76bcdd44
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10656 bytes
SHA-256: adccddbe6c3ad121ae147ff88eabef9d80a40e13cd006b2596554161a07d4b54