Malicious PDF — malware analysis report

Static analysis result for SHA-256 0818a21d91cbd002…

MALICIOUS

PDF

77.2 KB Created: 2021-03-19 00:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f4cbdd2307e560c1ac06dbfde02105b SHA-1: 50e32463268105e3ad91a3c0d36d2b6c8790c741 SHA-256: 0818a21d91cbd0027013a80e7900e8646170997363ce634fbf7860615f4964db
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to phishing sites or malware downloaders. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this is a phishing or content-scraping lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=faralda%2527s+notes+quest
    • https://cdn.sqhk.co/jesisoritet/liaTgev/ajax_post_formdata_datatype.pdf
    • https://cdn.sqhk.co/piwizogir/aJ8Omij/piano_keys_labeled_36_keys.pdf
    • https://cdn.sqhk.co/zapusukajev/ghijcie/sticky_sticky_bubble_gum_dr._jean.pdf
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/b40cff5e4124.pdf
    • https://cdn.sqhk.co/vixukose/3XxP9HU/41059830946.pdf
    • https://cdn.sqhk.co/budatumibowu/gchihiP/wavexusadifafenok.pdf
    • https://cdn.sqhk.co/nupopobax/ahcajeu/71675523209.pdf
    • https://mobafowowa.weebly.com/uploads/1/3/3/9/133997459/3134618.pdf
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/3068644.pdf
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/wumadarefikivos.pdf
    • http://fusubakitakudup.66ghz.com/70747468420.pdf
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/zozotezuf-jegafogazubosif.pdf
    • https://cdn.sqhk.co/dakuwuwuzije/wcrriaj/43524152981.pdf
    • https://cdn.sqhk.co/nutewakizi/7Ajg4RT/prison_break_season_5_movie_netflix.pdf
    • https://cdn.sqhk.co/tekuligote/0Lojegj/fajulikow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zazupixuwup.rf.gd/pojedupajalowojego.pdf
    • https://uploads.strikinglycdn.com/files/e0243cdf-8bd6-4aa0-8311-f8c1124b4a67/spoken_english_classes_for_adults_in_chennai.pdf
    • https://uploads.strikinglycdn.com/files/e249535b-c75a-4d61-9c5c-3ba031876ec1/houston_texas_zip_code_harris_county.pdf
    • https://uploads.strikinglycdn.com/files/4226375e-e308-473f-a0f0-46a404682570/netters_anatomy_flash_cards_app_free.pdf
    • https://uploads.strikinglycdn.com/files/17b43c14-7a60-42ef-9e99-54fbdb88f28a/honeywell_tb8220u1003_visionpro_8000_programmable_thermostat_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/bfa2df76-745d-48c6-a5cb-c65abbafb98e/fraud_examiner_certification_uk.pdf
    • https://uploads.strikinglycdn.com/files/93034171-27e7-46cd-8e0f-f479f969e5ab/32141135517.pdf
    • http://kuvepagigifu.rf.gd/wewimede.pdf
    • http://kedenutorufet.rf.gd/xiferexulobazix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ac.bin
8526d46e23d80832655d62745ae14dc6d9c89a0625958386f06dba80ea2a892e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 4932 bytes
font_01_sfnt_off00010484.bin
b9a8dcee66e26fdd99054756cc9ff1a9bca0bf9dbe25b0efc264295d9346c999
pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10320 bytes