Malicious PDF — malware analysis report

Static analysis result for SHA-256 3662413c3f0a9c35…

MALICIOUS

PDF

71.7 KB Created: 2021-03-08 11:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5fc5364d21c5980c3ea5383ee3c56bba SHA-1: 8d7bd1d92e0854a8d5052b0bbc7660017ec63d26 SHA-256: 3662413c3f0a9c35b71dfe16618569713d26b6c074ef8058434accdc90338488
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to potentially harmful content. The presence of external URIs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=casio+f-91w+alarm+off PDF link annotation
    • https://bujovuve.weebly.com/uploads/1/3/0/7/130738596/gedugaxagifogexakan.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/bugojut-razotagom-menubulu.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/39963918910.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/51646455907.pdfIn PDF document text
    • https://setijuxuzazoba.weebly.com/uploads/1/3/4/5/134500005/rewidusis-zenumedivigapo.pdfIn PDF document text
    • https://memapuzubabevu.weebly.com/uploads/1/3/0/8/130813849/podowaruvamoranekuze.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/how_to_iso_certification.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/starting_point_andy_stanley_season_24.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/kejoxixunozuwufovu.pdfIn PDF document text
    • http://tidajipameme.22web.org/gegix.pdfIn PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/xesozejotijiwi-sakulomasomuku.pdfIn PDF document text
    • http://dugules.iblogger.org/dizazinadipixi.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/pibilapanujax.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/predictive_analytics_definition.pdfIn PDF document text
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/1395829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://seroritubofa.atwebpages.com/types_of_drill_in_indian_army.pdfIn PDF document text
    • http://patupafu.rf.gd/jeet_kune_do_training_videos_download.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_9b0257fd93ea4a098e0bcdd8a9dffb00.pdf?index=trueIn PDF document text
    • http://disukifas.epizy.com/what_is_a_good_rub_for_smoked_brisket.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_84fbe7f4fa324d888a7cbc56e8e3689a.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_07666d11b95a49edb70220ce57f4df4e.pdf?index=trueIn PDF document text
    • http://vepesupilet.epizy.com/assinatura_digital_invalida.pdfIn PDF document text
    • http://pazepoxi.atwebpages.com/what_food_makes_gout_worse.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 4752 bytes
SHA-256: b34c3a64d5bb4f198bf9952c39bf2f8f393729c85d126d1aa146b940db1fc167
font_01_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 9904 bytes
SHA-256: 7bc339cadf8f237c8d80ab65c13c78e300b73892fe6667ae8b2fce290ef0e81f
font_02_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3