Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42cae63c637f861…

MALICIOUS

PDF

78.1 KB Created: 2021-03-12 11:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: edb43a6e21e6e5955269deb5b49f3f54 SHA-1: 5f76b3ca784db74f4a203233c33691bc020cd5df SHA-256: d42cae63c637f861c49c212bddf9709d6aa364acd5eda1e66062a345b5440fb1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the overall structure point towards a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=inventory+management+system+project+report+pdf PDF link annotation
    • https://cdn.sqhk.co/sezunofubuzi/jeichgT/ragulekexexinito.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/EctjabC/93718855621.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/gdshhgd/xanusulesoduwe.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/ahf5EAa/home_ice_cream_delivery_truck.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/heifMih/plant_diary_ks1.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/enemy_pie_art_activities.pdfIn PDF document text
    • http://gunodopo.22web.org/how_to_fix_google_search_bar_on_home_screen.pdfIn PDF document text
    • http://xivitej.66ghz.com/noperogepojawen.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/51168716619.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/gegeuq5/xukopiji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwuxuk.epizy.com/direct_speech_worksheets_for_year_3.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/solving_right_triangles_worksheet_answer_key_math_aids.pdfIn PDF document text
    • http://sexikiti.epizy.com/song_bechara_dil.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/crossref_similarity_check_free.pdfIn PDF document text
    • http://laruvixeritage.rf.gd/sifibapev.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/answer_synonym_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/jasopavolepimo.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/22989389737.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/12263103558.pdfIn PDF document text
    • http://givaradipokez.epizy.com/trends_shaping_education.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/creative_sb_x-fi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5620 bytes
SHA-256: 14afec07977d278aa100ead17e1558d36c4db7ee9f9b98a6d253f50ccb2dfd6a
font_01_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 10112 bytes
SHA-256: 5f3ec852c809d5717234fb0da7adcbced7f8c11f1d296719ddaf5d4c03be9825

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