Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c6003f1366aca…

MALICIOUS

PDF

80.1 KB Created: 2021-03-24 15:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2df262454de4c6ecd24a36598ca0c82d SHA-1: 5e2bc249a694e5e40c9bb6f11970f338dfcf448c SHA-256: 5b1c6003f1366acac872b98be66b6c2b2729f3a31b895dc86f2809aa5c986ea2
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous external URIs and is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/wix?keyword=laplace+transforms+table PDF link annotation
    • http://bajifepeselok.sportsontheweb.net/54142032063.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/merakafomim.pdfIn PDF document text
    • http://zazutokanug.22web.org/cadillac_xts_2016_manual.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/nespresso_use_own_coffee.pdfIn PDF document text
    • http://hotgirls.host/mixarifovegigabozojuserec8x4v.pdfIn PDF document text
    • http://gunoxeririrof.iblogger.org/forex_price_action_scalping_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/UKEprln/42806322868.pdfIn PDF document text
    • http://kabonuwumew.66ghz.com/rekakusadidelakopusisen.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/ihcPH1d/27784993290.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/vsFiejj/consumer_reports_used_car_ratings_2013.pdfIn PDF document text
    • http://bakavorun.getenjoyment.net/samuwigogasejefuduwawilu.pdfIn PDF document text
    • http://aires.fun/merigikefenabipuvijixemu6gd0n.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/Mggcwhf/89955854982.pdfIn PDF document text
    • http://glasshookahcatering.com/nv4500_rebuild_kit_4x4elvur.pdfIn PDF document text
    • http://uaportal.site/58978910685eziv2.pdfIn PDF document text
    • http://rijebutaj.22web.org/endocardite_bacteriana_em_caes.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/how_to_change_wallet_password_in_oracle_12c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://falariwupap.myartsonline.com/18771629094.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/the_art_of_choice_sheena_iyengar.pdfIn PDF document text
    • http://zagasazibizit.epizy.com/revolusi_amerika_serikat.pdfIn PDF document text
    • http://bujoginivela.epizy.com/jiwaxatat.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/what_is_statistical_methods.pdfIn PDF document text
    • http://funadorexizuju.rf.gd/7804601515.pdfIn PDF document text
    • http://guzumirofega.epizy.com/argumentative_essay_conclusion_format.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 5240 bytes
SHA-256: 3700f3e69446062827f9a04f1a150aa7df276a2922b47de7ecf9ef5c853e8e89
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 12024 bytes
SHA-256: 62e739bb6d82075ebcdfe73877833232c15d23cd097bd60bc087d1f3c1e1d024
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 16064 bytes
SHA-256: 8407df14a2738efe3d2aaec449fc7b67f888222f7621c5c094f7d2f3a91843ca

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