Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8d6e50cf3fe623…

MALICIOUS

PDF

86.0 KB Created: 2021-03-21 11:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a7f7f9c1d4c0ab98a15b6cfbbc5c88 SHA-1: 823f53be93baf407857998c03f8a3f6c738f5ee0 SHA-256: 1c8d6e50cf3fe6238466280459394e86736cf2a1b0008dcba1203b95c1b8b544
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, indicating a link farm or phishing attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body, though heavily obfuscated, suggests a lure related to collectible guides, likely to entice users to click on malicious links.

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://gimoguvi.ru/wix?keyword=zip+beanie+baby+mcdonalds+value+guide
    • http://murimubijejaba.mygamesonline.org/balarama_download_free.pdf
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff048d5965d1.pdf
    • http://vowufijetapiko.sportsontheweb.net/diet_plan_to_lose_weight_and_tone_up.pdf
    • http://jirusulixozome.scienceontheweb.net/79063949284.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_600d4425929de.pdf
    • https://static.s123-cdn-static.com/uploads/4402938/normal_6007ef506f853.pdf
    • http://vuzuwul.getenjoyment.net/49396993632.pdf
    • https://cdn-cms.f-static.net/uploads/4454668/normal_60304909754c9.pdf
    • http://ratamaperekeja.22web.org/zaxovoripaxupel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_1f18c17de9514c149102b6590ef7bf12.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3aeba94b-a269-4560-9a04-3c19407ded81/pifaxijeroxin.pdf
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_4f1c3e978f3042d8b8172d77cda3bcbe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1018c1e-1317-4656-bc69-366cf247524f/canon_powershot_sx100_is_digital_camera.pdf
    • https://uploads.strikinglycdn.com/files/6f7890e0-ed3d-432b-bfe9-410ac74213f8/how_to_configure_nanostation_loco_m2_as_repeater.pdf
    • http://rotufixijisadi.onlinewebshop.net/sozupinatikamojis.pdf
    • https://s3.amazonaws.com/falejogajir/tuvibivitew.pdf
    • https://s3.amazonaws.com/wazagidonux/fedex_tracking_id_lookup.pdf
    • https://s3.amazonaws.com/wupixufekijax/how_to_convert_a_linear_equation_in_standard_form_to_slope-intercept_form.pdf
    • http://duxurulokij.epizy.com/afro_beats_2019.pdf
    • http://dejujerun.rf.gd/blind_boy_by_colley_cibber_question_answer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ed1.bin
8ee700d671ac7a92eec38ffc5ec90bade26ac61aba24d4d7aef573fa43cf3346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 5556 bytes
font_01_sfnt_off000121b3.bin
d05b14da022a92513672092fcf0d82eaa8422b5222289cadff83c72f1b7c469b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 11584 bytes

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