Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade42e4ecd901d67…

MALICIOUS

PDF

89.7 KB Created: 2021-05-05 23:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9091e5c16b3498d6f8db746de02b0e86 SHA-1: 288e2ac7f38157ea85c590501711184a785f5ad3 SHA-256: ade42e4ecd901d67817cf374ed1e7dd4b1ef4bbeb795b7c5b5f0bc5251e32ab8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'superior good' and 'wkhtmltopdf', indicating a potential social engineering pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+is+a+superior+good PDF link annotation
    • http://compte-cmbretagne.best/36482327872p6aib.pdfIn PDF document text
    • http://detonic-deutschland.website/bulikonojenewogaret3gjfg.pdfIn PDF document text
    • http://olipaka.xyz/nomaridurozohnql.pdfIn PDF document text
    • http://kizijele.iblogger.org/5645438771.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/junigutokldeiw.pdfIn PDF document text
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/fifezuwi.pdfIn PDF document text
    • http://my-credit.info/discovery_bible_study_methodorpvf.pdfIn PDF document text
    • http://investmag.org/how_to_thread_a_spartan_sewing_machinelnktu.pdfIn PDF document text
    • https://gokavebaraxev.weebly.com/uploads/1/3/5/3/135309677/xarewolodezaf_lawetovajovemu.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/Onagc5w/multirotor_sim_2_mod_apk_unlimited_money.pdfIn PDF document text
    • http://rezonansmusic.com/online_convert_jpg_to_combinecaolt.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/j3wih2O/58646547437.pdfIn PDF document text
    • http://chelamela.org/wonuddkovp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezisekovedafow.epizy.com/37594747607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcd5a27-12f8-428c-8b7a-ebae4e390706/19708529691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8226fd0e-71d2-40e4-9bba-0178df0faa62/40106745722.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/adobe_premiere_pro_cc_classroom_in_a_book_by_maxim_jago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7053a75-035b-410a-9396-7d22c1530e82/dowiwawitujafixenerezuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae71e4d-74cb-4457-9355-a7809db9c1e8/black_max_21_160cc_self-propelled_mower_manual.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_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 5200 bytes
SHA-256: 5b40543a30cb402d2b575a94fd494dd7aa8122a3b7c42291911c5e135834004b
font_01_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 14232 bytes
SHA-256: 2b58dc7831692ae2c0b035316f018134bef41366a46181b9faa3963a1d99d97f

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