Malicious PDF — malware analysis report

Static analysis result for SHA-256 61579b5e2972eeb6…

MALICIOUS

PDF

71.6 KB Created: 2021-03-19 07:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0164a68ec06f2b9f1fc8dfc0188d3bbb SHA-1: 0a30234bacf60839b075a26609e92edee0edef07 SHA-256: 61579b5e2972eeb609746b3e9350da9df26c4ac6eedf1da889cc0a80ceac4280
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/123?utm_term=traffic+incidents+nsw+report PDF link annotation
    • http://sijubuwejipamun.mywebcommunity.org/anodea_judith_wheels_of_life_free.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/WnghLhf/my_city_airport_shuttle_cape_town.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/84149170aa07f.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/fotebitose-paguzaluwugixu.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/VuwevQE/xerepadakaramo.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/sap_bods_tutorials_point.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/67477660174.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/sCnjhpg/55871774985.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/xiloten_sinerit_gisase.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/hp_deskjet_plus_4120_not_connecting_to_wifi.pdfIn PDF document text
    • https://tuzokoluxalof.weebly.com/uploads/1/3/1/3/131382257/xuxogibesujora-sisatewojub-fepoti-piwovobuv.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/ramevuse.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/fghib4K/bbc_mundo_economia_argentina.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/ckmbNge/pottery_with_glaze_designs.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/plant_high_school_calendar_2019.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/papixekax.pdfIn PDF document text
    • http://kevikakagax.iblogger.org/venn_diagram_powerpoint_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_6eb36fb958194638b32a01a5ce2de0b8.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_398340fe7fb24a29a7cc4cf08853b843.pdf?index=trueIn PDF document text
    • http://defisunukotizid.epizy.com/what_is_cvo_curriculum_vitae_in_afrikaans.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_f555352280474f089ece1038ce9f5247.pdf?index=trueIn PDF document text
    • http://jonesojawu.myartsonline.com/47470577357.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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 5160 bytes
SHA-256: ae3d585dd9e1ab4666cfcf8b10a97af0591ceff1f985ebd7e67dc27eb5b29abd
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 10008 bytes
SHA-256: f9b80f09485669358c51470ede54f67ccee521fc1f48aaf6101d517767312b54