Malicious PDF — malware analysis report

Static analysis result for SHA-256 931eb455d71acc3c…

MALICIOUS

PDF

71.8 KB Created: 2021-02-14 00:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ba75b6022f01e13cbdbaf5a492c9c606 SHA-1: 0881f10fff46f43ed9fea15db8034174a3becc92 SHA-256: 931eb455d71acc3c6faf544c46397099257c01f34e4c8fcd2af54069d5253d49
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or scam attempt. The heuristic 'SE_URGENCY_LURE' suggests the document uses urgent language to prompt user interaction. Although no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence score strongly suggest malicious intent, likely to deliver a secondary payload or lead to a phishing site.

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/wix?keyword=craigslist+columbus+personals In PDF document text
    • http://1offpark.xyz/4704643075asotz.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/hbibhiJ/pusajagojatevog.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/Htbzjbg/easy_pound_cake_recipe_with_cake_flour.pdfIn PDF document text
    • http://copyrighthelpptteam.com/mp3_download_manager_mdm_indirxpozp.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/5kYTWOU/lomonebiviwitago.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/trghejd/neptunia_re_birth1_true_ending_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/6hcjajh/2020_election_results_so_far_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/8Ijegdi/98318947074.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/jcxtLge/49607744613.pdfIn PDF document text
    • http://nutosolawuxa.iblogger.org/cozy_house_microfiber_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/geqXghn/carmageddon_tdr_2000.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/l9mcjdL/high_speed_street_bike_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/fjgr5ii/unblocked_car_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/hK1Ovii/pathogen_meaning_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favilogas.rf.gd/thankful_answered_prayer_quotes.pdfIn PDF document text
    • http://zuwarikufaz.epizy.com/georgetown_law_externship_guide.pdfIn PDF document text
    • http://libiwozurogufo.rf.gd/dadokodofopubijad.pdfIn PDF document text
    • http://kotidaw.epizy.com/sezibik.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/immortal_syndicate_boss_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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 5300 bytes
SHA-256: 3cbbee4f5b96815a613b24101f698127a190068da5e58286a64fddb806c27985
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 10080 bytes
SHA-256: adc154b12fca3379650dc9b5aaee1b681858d32fae58785a101e55006f29c5f0

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