Malicious PDF — malware analysis report

Static analysis result for SHA-256 1802a127c7954e48…

MALICIOUS

PDF

77.4 KB Created: 2021-02-27 09:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0ea5ea6ccf928f44ea0df481a891ce0d SHA-1: b7c561fd7edb346c8adb8518f4fc4fd3453014b0 SHA-256: 1802a127c7954e48a5a9550b725ab0c18af5517a4bcf891714dba9b1147d97f8
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to host or redirect to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to deliver further malicious payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=why+was+the+fall+of+rome+significant PDF link annotation
    • http://nukels.xyz/el_conde_de_montecristo_pelicula_1975_onliney0cov.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/wuxijuzugibasavip.pdfIn PDF document text
    • http://omshop.space/word7je3i.pdfIn PDF document text
    • http://reduslimitalia.website/speed_queen_washer_supportc5xts.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/41822289659.pdfIn PDF document text
    • http://pribor-poverka.site/zojepewiwapohwplj.pdfIn PDF document text
    • http://jovalevuwalu.22web.org/strength_training_program_without_weights.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/sipifis.pdfIn PDF document text
    • https://cdn.sqhk.co/bogebumemilo/5gdvnjd/zopozizidijowinox.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/10445147101.pdfIn PDF document text
    • http://pagefufobixew.22web.org/minecraft_pc_apk_appvn.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/is_sanji_stronger_than_his_family.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/201041202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potamotaz/widitekolumarafufigimoda.pdfIn PDF document text
    • http://tipunif.epizy.com/onkyo_av_receiver_tx-sr505_manual.pdfIn PDF document text
    • http://podixisuxusajez.rf.gd/how_to_get_rid_of_mildew_smell_in_top_load_washing_machine.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_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 5500 bytes
SHA-256: 9ef9cf68a581b211db1256ecca8c42b034fc5e887809a665a2887244c0e8b451
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 11808 bytes
SHA-256: a001a33a8f7dda486e93797693920af19d8a0e104c446ec3b0f97b431e4d9012

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