Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23b3d585bcc7ad7…

MALICIOUS

PDF

87.3 KB Created: 2021-05-02 21:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31393f9519f7d52994b63df74085e917 SHA-1: cec970bf90153d5d22f906cb8422807061779cc6 SHA-256: b23b3d585bcc7ad7a81de0def84c7bf5d62841f0ec5238e015c0e9c06ffad35d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, 'https://resalured.ru/strik?utm_term=10+000+year+explosion', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=10+000+year+explosion
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/sezalil-fetom-gisolikibipamil-papofuxer.pdf
    • http://jevafurevozu.mygamesonline.org/warhammer_40k_8th_necron_codex.pdf
    • https://cdn-cms.f-static.net/uploads/4369327/normal_602b24b1b1514.pdf
    • https://moganuvutixeku.weebly.com/uploads/1/3/1/1/131163890/9919405.pdf
    • http://rejemezurufoveg.mywebcommunity.org/does_target_do_sodastream_refills.pdf
    • https://cdn-cms.f-static.net/uploads/4368999/normal_6010028e67693.pdf
    • http://kidiwutimako.mygamesonline.org/purijomuwebitotosezeva.pdf
    • http://bikomowaxibujoj.medianewsonline.com/history_of_bretton_woods_system.pdf
    • https://badazunezibak.weebly.com/uploads/1/3/5/3/135338398/1981896.pdf
    • http://mixutadumekaje.mypressonline.com/how_to_setup_craftsman_assurelink.pdf
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/3605543.pdf
    • https://cdn-cms.f-static.net/uploads/4370286/normal_603bc078c7baf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xijuxosisomuna/64820667116.pdf
    • https://uploads.strikinglycdn.com/files/a3e86848-2bfa-4e8b-8b6f-9cc40264657a/craftsman_12_inch_miter_saw_price.pdf
    • https://s3.amazonaws.com/zifozujiwi/glencoe_science_biology_chapter_1_assessment_answers.pdf
    • https://uploads.strikinglycdn.com/files/1796dd66-b223-415e-ae6f-1b66a90c590a/how_old_was_the_cast_of_vampire_diaries_season_1.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/adobe_premiere_elements_free_download_full_version_for_windows_10.pdf
    • https://s3.amazonaws.com/pukiza/ramas_de_la_carotida_externa.pdf
    • https://uploads.strikinglycdn.com/files/4051cffa-aa43-4f7e-83f5-47da65535d21/kafuwusedamuluzamok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a6a.bin
059e498d09cf94a14c7bcea955f1276eb6096428f65983e2b43155f3a1309d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 5084 bytes
font_01_sfnt_off00012bd2.bin
7304d92699093ec0901e39a0022ceda49e1600b0a37c3ce4e0a106505d4a3c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 10760 bytes

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