Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d43376e04951782…

MALICIOUS

PDF

88.3 KB Created: 2021-04-05 23:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b4d920a2b001bef76b46056c5efa9f82 SHA-1: 5287dc93e3faab8adf646f48b26c106e0a40605e SHA-256: 1d43376e049517829736cf7915f4f3cd4cf4b805bfde6faae50074760a1e4d64
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 0.9961

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://gimoguvi.ru/award?keyword=pv+annuity+table+pdf PDF link annotation
    • https://totimukax.weebly.com/uploads/1/3/0/7/130739837/023391.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/8066817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445729/normal_5feef78781e34.pdfIn PDF document text
    • http://kaverijamawe.iblogger.org/achievers_richmond_a1.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/Ojjggou/wezebasebesixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_605ce91a7d9ee.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/4578259.pdfIn PDF document text
    • https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/9055f9.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/mewirukirirawe_zivezajitulo_pumonovaz_dogunavi.pdfIn PDF document text
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/d3725a.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/dQhb6zq/que_son_las_bases_nitrogenadas.pdfIn PDF document text
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/xajuxux.pdfIn PDF document text
    • https://manovofaripoluf.weebly.com/uploads/1/3/1/4/131453531/f4a5c74.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxobilan/hbUgfii/bloons_td_super_monkey_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/EibiiCd/73839144540.pdfIn PDF document text
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/9425525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481067/normal_5ff8968247642.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/0hdiCu0/scrutinizers_report_for_e-_voting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kukejisagev.epizy.com/animal_sounds_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/zadotixolidu.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/tinivivu.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/lifeformations_bowling_green_oh_43402.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/79739561895.pdfIn PDF document text
    • http://doronelibi.rf.gd/creative_writing_for_dummies_free_download.pdfIn PDF document text
    • http://zokazote.rf.gd/zojekolowa.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/maplestory_mobile_mesos_guide.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_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 5064 bytes
SHA-256: 3ca8ed95d261c175055af664f9e6c52cea96a81644d6d44b8b2f93d65bf1c2ef
font_01_sfnt_off00012bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 11824 bytes
SHA-256: 98d09ff2412b0a288fa740c0650f40b08ff1ed892d1a25bca3a031bb1c0f346b