Malicious PDF — malware analysis report

Static analysis result for SHA-256 650d8adc08cf58ad…

MALICIOUS

PDF

80.8 KB Created: 2021-06-13 16:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9617245461c650968839ce59e50ecfb SHA-1: 256534dbdee77e03971d00602ad498464980f5a9 SHA-256: 650d8adc08cf58adf4dae8ea4fb752b77a0f0df97f8ad3d2624ec4e6e139b641
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/pbw?utm_term=mercy+mercy+mercy+cannonball+adderley+chords PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453144/normal_6009760c17c3d.pdfIn PDF document text
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/xobodedabesoxape.pdfIn PDF document text
    • https://mijebekebune.weebly.com/uploads/1/3/4/0/134017127/743f8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fcd7040f0ebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5fdebc2e47e2d.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/4849a47d.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/9a85ac91.pdfIn PDF document text
    • https://jevupatumatawi.weebly.com/uploads/1/3/4/3/134377955/5580854.pdfIn PDF document text
    • https://potuvomominoneb.weebly.com/uploads/1/3/2/6/132683031/7feae809b677ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_605582ea37b94.pdfIn PDF document text
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/dalesaworatenub_sazosezamozor_kubesedumog.pdfIn PDF document text
    • https://jijuvujoxepika.weebly.com/uploads/1/3/4/7/134740737/zumejena.pdfIn PDF document text
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/rijek.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/vakizifugik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pajajafilexe.pbworks.com/w/file/fetch/144730455/comandos_de_sketchup_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0b4007-dce2-47e0-8733-f7531513173c/bhagavad_gita_slokas_in_english_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223f5232-2aba-4a94-8ddf-c33c1133ea11/25561429982.pdfIn PDF document text
    • http://zokosixaged.pbworks.com/f/reaction_with_lialh4.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144741135/dodoma_secondary_school_joining_instruction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c093d67-6c60-4772-8015-03cf14d398f0/76099447713.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/what_otc_drugs_help_covid_symptoms.pdfIn PDF document text
    • http://xigikegom.pbworks.com/w/file/fetch/145248621/buviget.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_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 5428 bytes
SHA-256: 4713af5cf049468f83e64ba1e9bf66cc25959febeabbe4b3d8a60d38d4c5e5fe
font_01_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 10980 bytes
SHA-256: 771c0d772c63ade2daf9210395f121cda4bed2bcf4c21e362c37eeb7c441c007