Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bc24f213608d9d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 03:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8c9cc6b828e560220e896a173c291c82 SHA-1: 1d8582de8a72ff5b199ec0e82819f2c927749e9e SHA-256: 55bc24f213608d9d7096b0fe21dddccabaf0efefde7f126055d7f7020b3e40cf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggesting a phishing or link-farming scheme. The ML classifier and ClamAV detection confirm its malicious nature, likely as a trojan or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=percy+jackson+cast PDF link annotation
    • http://vevujegijozu.iblogger.org/black_bodies_white_gazes.pdfIn PDF document text
    • http://timelessdecorum.com/40068909273y9183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_601e7046c1494.pdfIn PDF document text
    • http://begemotiks.fun/83209574896arm34.pdfIn PDF document text
    • http://raisinsapp.club/how_to_use_ham_radio_without_a_licenseczacw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_60248daac179e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_604c9f0cdf7c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5feb5511b9e69.pdfIn PDF document text
    • http://jaladonubitow.22web.org/74956256891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_6026600e5d9e2.pdfIn PDF document text
    • http://zuwazari.22web.org/genilukawofudodutagirerur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_65d4d9f95b8640e89ab1bb2727361dcc.pdf?index=trueIn PDF document text
    • http://zavinawotomuvef.epizy.com/zopugovezumo.pdfIn PDF document text
    • http://zezevefo.rf.gd/visual_basic_6.0_software_free_download_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4740a7f1-a6bc-4f2b-a101-52c33a3b58a0/dalotejukevenoxanugim.pdfIn PDF document text
    • http://poxemibusap.epizy.com/96674792265.pdfIn PDF document text
    • http://tefabonapo.rf.gd/sheet_pan_chicken_piccata_defined_dish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beee182c-09ea-4c56-9fbd-bb52ff8ae78a/cuisinart_compact_juice_extractor_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b2764f-436a-4cc8-8d59-02392e1f7392/how_long_does_star_citizen_take_to_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58479e6-5fb7-45e0-96ac-6bc81ab1e897/badger_5_garbage_disposal_1_2_hp_insinkerator_badger_5_with_cord.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_2f9d5e99bc584da6a856defdf9726ab9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/102f4ef4-31e2-4dbb-ac16-052721b7ed0a/nolixujata.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5004 bytes
SHA-256: 65af9533e7fbb07540833a04d5fe3e97cfc6e9f1836f74c7f583d8ea0d328688
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 10948 bytes
SHA-256: d5b32f14028fec911e2bb70a802eacd01ae8b42b2b8c1357cf4355ccf3fc5452

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