Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cd5d2d8414d89d…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 20:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 69c91f0d5989d0144253f1c6d869ee53 SHA-1: 7425cb8b2089f2a8b8db895277210947068a48b2 SHA-256: 29cd5d2d8414d89da312f1bfda9ac29d7ceb5acdb8c42bfdcb3685b1bc66edbe
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains references to 'Butterworths law dictionary pdf' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=butterworths+law+dictionary+pdf PDF link annotation
    • http://mumijivamivaxij.medianewsonline.com/2008_dodge_avenger_rt_transmission_fluid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_6049f48c7c289.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/yihn1ie/live_voice_changer_for_discord.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/bankruptcy_and_insolvency_act_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ifijalp/99185972455.pdfIn PDF document text
    • https://kigatuxusim.weebly.com/uploads/1/3/5/3/135305206/59de3.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/dhgigOM/18764399494.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/wevapudasetutoxaxuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_6009a991daafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_603c55ff67808.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/rigumo.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/hbkibVp/lego_hidden_side_app_not_working_on_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_6011a760ed9b3.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/batman_death_in_the_family_online_sa_prevodom.pdfIn PDF document text
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/figegip_biniboxepepu_nuxijemawawu_jujibifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_601bb6a43eb4f.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/tixeligufokup/79657126870.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/pokemon_let_s_go_eevee_strategy_guide.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_6a04df1e3277443395801aa15ba3766a.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_ba0e6302e8a441c7aa45f1347ead94d8.pdf?index=trueIn 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_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 5484 bytes
SHA-256: 7a2b3aee5cb42328ae6abe9348f3db1ab9adfdacfa2181c9ddea451519afa2e0
font_01_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 11424 bytes
SHA-256: b67c12d27e65a21454305e1f3367b761ad8945bfb64eed869691e712743f889f

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