Malicious PDF — malware analysis report

Static analysis result for SHA-256 7676c2dd7f3e45d1…

MALICIOUS

PDF

68.2 KB Created: 2021-02-25 22:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d39c86abfcccfc07bbcd86b2ddb38f14 SHA-1: 9f4ad369ab2acd67a8789eac1d8c3b28f1162dce SHA-256: 7676c2dd7f3e45d13314c32acf1ebc927aed1c2dd8f3f3512851e96f7eb5887d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to external websites, with one heuristic specifically identifying a link to an algorithmically-generated URL likely intended for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to software and dates, potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jacksth.ru/award?keyword=windows+server+2012+r2+standard+dell+oem+iso PDF link annotation
    • http://ourfanz.com/fozejudujiqcly8.pdfIn PDF document text
    • http://goossyy.online/59038193714chttu.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/sunozuweparirixe.pdfIn PDF document text
    • http://mainsale.pro/answer_to_divorce_complaint_massachusettsk509i.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/lunal.pdfIn PDF document text
    • http://org-fruit.space/xorugdimv6.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/tu_puedes_sanar_tu_vida_de_louise_l._hay.pdfIn PDF document text
    • http://appletopshop.ru/wanted_bengali_movie_video7mcps.pdfIn PDF document text
    • http://teaitalis.space/miss_prepa_7_fotos_sem_censurahjjeq.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/59966249198.pdfIn PDF document text
    • http://geleostone.online/10018442727bss7r.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/cars_2006_chick_hicks1ipj9.pdfIn PDF document text
    • http://terugate.mypressonline.com/dedication_page_with_blanche_of_castile_function.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/samugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidiwen.epizy.com/8th_grade_weekly_spelling_words.pdfIn PDF document text
    • http://livirava.atwebpages.com/jumitosanusov.pdfIn PDF document text
    • http://regaguw.rf.gd/disasorafuraxemu.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_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 5460 bytes
SHA-256: 9805cead4227488b2207cb774bbe0bdfad3caaa42ec009c94ba031fe634a060a
font_01_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 10568 bytes
SHA-256: 0575adddab347a0b7e6057b89028bc69e310d3b1342105b7a4bf70733455127a

Open this report in the interactive analyzer, or submit your own file for analysis.