Malicious PDF — malware analysis report

Static analysis result for SHA-256 4641f8665ebcc311…

MALICIOUS

PDF

78.8 KB Created: 2021-05-03 02:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fb11ff2e540d364b6b1ea4a57dde027e SHA-1: 71e27cc89e7b314e3075cdecd8bc7fd5a589727a SHA-256: 4641f8665ebcc311215e7a2b409392663842c0ff8bc49852d2f8f540fe5225ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://ponafet.ru/strik?utm_term=2012+camry+value+canada PDF link annotation
    • https://mirenixumevi.weebly.com/uploads/1/3/5/3/135309561/sumikowenaw.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/lemogaxakofonafox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fccb0b0852d3.pdfIn PDF document text
    • https://sevifebelupese.weebly.com/uploads/1/3/4/0/134096480/pebadefejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_6047bb2a41637.pdfIn PDF document text
    • https://mixogefok.weebly.com/uploads/1/3/4/5/134587058/2130648.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/how_many_calories_should_a_small_dog_eat_per_day.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/gajut-vukanenenid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_606b65b58d2b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_5fdf11ddc1b2a.pdfIn PDF document text
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/fetofebuvomajes-sabomowejov-javoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxime/american_horror_story_cult_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/kubiti.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/34925525315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5485f586-6578-4f29-96aa-c66bc071c178/navy_new_pt_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/2006_ford_6.0_diesel_engine_oil_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/foveperovubuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/ruzotabakodukonujoximiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d943cf-9ea0-41c6-9a5a-ffa2d57b2ca9/tabla_peridica_completa_con_valencias.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/wavepad_audio_editor_apk_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce335c4-7989-40f1-b0c5-dde928897e7e/stihl_ms310_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/56784311795.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/fodikoleverafepemenitedux.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_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 5300 bytes
SHA-256: 62be9f3f1c53ab32d8b1bb87a0af4594307445807bbe248dac759fd75aa6ecbd
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 12076 bytes
SHA-256: 113698d280895a3c2bc51b270a590998333cc42b0edb2d64e26cdce484df08bd

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