Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9802c11dd1caa8f…

MALICIOUS

PDF

73.7 KB Created: 2021-03-25 00:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6031a01e376b799b48ee5e8318d24992 SHA-1: 2214402ba79b9093b207bab20eaf1c93599d511e SHA-256: c9802c11dd1caa8fb439305c8272de708ccde6b46b52caa7143beb0b9c4f935b
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and contains a large number of external links, many hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'Ielts writing task' to drive traffic to these external sites. The presence of PDF_URI and PDF_SEO_LINK_FARM heuristics indicates a link farm strategy, likely for SEO manipulation or phishing.

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://fokemale.ru/award?keyword=ielts+writing+task+1+and+2+answer+sheet+pdf PDF link annotation
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/806ada.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/nelurutolewava-fojozib.pdfIn PDF document text
    • https://wixivowid.weebly.com/uploads/1/3/4/6/134689466/1721975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_604f54e38d97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_601e13f400144.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/7007729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_60019e8d05a9c.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/rugulewadoziris-kefuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_6049416f2209e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_60517a22dabbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_d301894298a046349ff3142643ab17fe.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_fff27da05b6548e7bbb9812aee183679.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/vutuganodojesejeside.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_ea25a64fc42544edbde063305a3fae61.pdf?index=trueIn PDF document text
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_c6eef958200647a787ecee96077e026e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/xijoxiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/vuwinaxamujepirapomu.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_8a64d7cd85a94de189a651fdb4562129.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/latest_bollywood_movies_free_in_hd.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_1db76aa457494f3788882b6c218903b5.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_a4ec1fb6f6504cb380453f16f38ae575.pdf?index=trueIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_d7800109662c4c2b96309cd4ac20e59c.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_a070a920e84d463388c9d08ab076ac4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/el_escudero_de_dios_2.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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 5580 bytes
SHA-256: 5373d2dd26dfebc5815b32b2da88e86cddc99d1b42c241c9696fe9962a683938
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10880 bytes
SHA-256: 503c33f1ec85033489be590167f14d6d67b840d4320723a0432cea191b33b370

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