Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c7707a5d2b887f…

MALICIOUS

PDF

76.7 KB Created: 2021-02-19 04:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: aa3e5f0d0ecacc7082e24d0e502af2be SHA-1: 4f9bc74d82562e91f97c1d01dddb83f86a5e077b SHA-256: 37c7707a5d2b887f7da32e32b599d0620ed582d2ece6e0ca13645bcf5a228d33
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The document body, though heavily obfuscated, appears to be a lure related to search queries, likely intended to drive traffic to these external sites. The presence of multiple external PDF links and the ML classifier's high confidence score indicate a malicious intent, possibly for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=how+much+does+a+deer+weigh+in+pounds PDF link annotation
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/kamoki.pdfIn PDF document text
    • https://javufivupa.weebly.com/uploads/1/3/4/3/134349262/rinapikov.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/litefatuxujo.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/95a2d85ffbb.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/fejokibowu.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/wuvakuzunotaxuj.pdfIn PDF document text
    • https://dekaraguw.weebly.com/uploads/1/3/4/5/134511216/zekutewasofa-repasebu-raraxaku-wetovoveji.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/iaJwhfg/dg_digital_coupons_sign_up.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/2252914.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/tuzopo-wozafex-kumemikij.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/wamomafafawusol.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/1268175.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ejhjeZW/legend_of_the_phoenix_mobile_game_cheats.pdfIn PDF document text
    • https://junenewawaxi.weebly.com/uploads/1/3/1/4/131407408/ribemikegawesat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feruvemijajo.epizy.com/oecd_guidelines_transfer_pricing_2010.pdfIn PDF document text
    • http://feselipalez.epizy.com/80178051669.pdfIn PDF document text
    • http://zaritopewebo.rf.gd/cardiovascular_system_book.pdfIn PDF document text
    • http://mowesedapi.epizy.com/yahoo_fantasy_basketball_mock_draft_report_card.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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 5508 bytes
SHA-256: b4a21c62a98bed6b0abcd306453b2f738e40ead55ac4d8214e549df7f95b34bd
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10676 bytes
SHA-256: 21248d748466555389ae4890e97011f464ea1cdf713354768b9474617d00f31a

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