Malicious PDF — malware analysis report

Static analysis result for SHA-256 521577f1d92232a6…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 23:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 14ad8f379702d6c50e3982661233146b SHA-1: ca6f316ad0546fabc9ce38a1db39b5889fc3c0e9 SHA-256: 521577f1d92232a66c476f4a33096e6f10e80b68ee36d8940fc0f9404b11bd00
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being 'https://jottigo.ru/wix?keyword=ethnographic+interview+sample+paper'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=ethnographic+interview+sample+paper PDF link annotation
    • http://wumiwuzigimo.mywebcommunity.org/80027130202.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/J2ijggO/matchbox_toy_soldiers_1_32.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/beginners_guide_to_crystals.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/83947024050.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/equity_capital_markets.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/jbxF3ha/50753134016.pdfIn PDF document text
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/4c6bd.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/gxHbgfE/stormfall_rise_of_balur_android_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/e5XHt4G/download_game_bounce_master_mod.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/3b38020540.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/abbyy_transformer_mac_os.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/fje7ie9/kuletele.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/3Iwehg4/bisaya_christian_song_praise_and_worship.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/iihjhgf/panda_pop_cheats.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/6017154820.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/hegcSjc/perfect_deadlift_form_side_view.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/96476427168.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/arDbnNG/62912854457.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/dogowewagovefetoda.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/7622794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e79edcb-62e4-41eb-a29e-db4ff6cccada/70983965636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a47158a-a1a0-40cf-b436-dedbcb67a76f/19281751548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467e4021-6ae0-445c-95d8-06df7bf3b313/wologinebixen.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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5456 bytes
SHA-256: 23305d39dc14fbeaf2c609ff1ab54bf8502d90162e91644b199cb48365e653ca
font_01_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 10668 bytes
SHA-256: 89ceeaae0e1276ae89e2a6b43778f9500e7450a3631f0c37c7984fb18b52cb88