Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1dbd2f617b027…

MALICIOUS

PDF

80.3 KB Created: 2021-03-17 22:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2071af33df36ea53de0b63816525703c SHA-1: 45123590e185c1fd3ab2e950be00a5f9e121d6e4 SHA-256: 87a1dbd2f617b0279fe06fb244495d45d486058e7208a49ade0d330cf565e236
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs, suggesting it functions as a link farm to direct users to potentially harmful websites. The presence of external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bologen.ru/strik?utm_term=how+to+adjust+carburetor+on+husqvarna+55+chainsaw PDF link annotation
    • http://lnstagram-blue-badge-form.com/mystic_messenger_guide_casual_storyw9erv.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/do_minors_need_id_to_fly_southwest.pdfIn PDF document text
    • http://nickned.me/84735699215jim7c.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/bggjegW/streams_live_in_five_ao3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_603c1255ddaaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/6KAjbYa/real_life_simulation_games_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5ffdec3370f98.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/e_aadhaar_download_online.pdfIn PDF document text
    • http://rkconstructionsucks.com/fogitebutekijfz2b9.pdfIn PDF document text
    • http://lezirumari.sportsontheweb.net/77662433862.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/firugobivukejosejozed.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/lJli0Jq/bootstrap_form_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_5fda87088d239.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/capriccio_24_paganini.pdfIn PDF document text
    • http://alkostore.xyz/bafogaravedewat97vio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff6aa24ab27a.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/jjhfjhf/jisuxokagef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_6006491e39978.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/what_does_visual_culture_include.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/1Sg1Thd/70233621777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_c24c28b6a03946f99af4383662fd8c9b.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_d1f02a3f8d3645c38d1dee078f1ac331.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_a5d3ff351967429c8633f400e8aae717.pdf?index=trueIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_3bdaed2278ed4ba6b368549591c2f68f.pdf?index=trueIn PDF document text
    • http://mewabetowa.myartsonline.com/19570586245.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/bushnell_yardage_pro_scout_review.pdfIn PDF document text
    • http://gagolabirej.atwebpages.com/josapiwilusaxamawanetag.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_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 5576 bytes
SHA-256: 1d78ed6d99bb843edf3c818cc44aa2f2f5580b30d6b52ae522b89db7f5a412f3
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 10772 bytes
SHA-256: 3ede9297df25326a3b7696da67f7e95876c679fd83257c28a62a0aa05a151af4