Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88e10d46d9ef827…

MALICIOUS

PDF

77.3 KB Created: 2021-04-16 14:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1abfa22954a2ed2086a137d82e6970cf SHA-1: 2e37f94830b57c5254e3f30da7ab4dd78095a116 SHA-256: a88e10d46d9ef8270e38da1bf6463ad634b0848ec9129703919c1983e9d0db05
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to `http://sutexuvidag.myartsonline.com/18806020853.pdf`. Another embedded URI `https://nipisod.ru/strik?utm_term=the+shack+full+movie+watch` suggests a lure for users interested in watching movies, likely to redirect them to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=the+shack+full+movie+watch
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fe6e05648170.pdf
    • http://kumululurug.scienceontheweb.net/44993365504.pdf
    • https://cdn-cms.f-static.net/uploads/4481282/normal_605b123e1db35.pdf
    • https://cdn-cms.f-static.net/uploads/4465267/normal_6068f86e65ea1.pdf
    • https://cdn-cms.f-static.net/uploads/4371514/normal_606e1a718a50d.pdf
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/8010c.pdf
    • https://cdn-cms.f-static.net/uploads/4475204/normal_602a090866510.pdf
    • https://jowiginuzag.weebly.com/uploads/1/3/1/4/131438641/nejajizori_bujigaw_gibiv.pdf
    • https://cdn-cms.f-static.net/uploads/4367268/normal_604168c297395.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/pevosopitoderuvumip.pdf
    • https://cdn-cms.f-static.net/uploads/4367017/normal_60338b19681bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sutexuvidag.myartsonline.com/18806020853.pdf
    • http://merovuditipin.onlinewebshop.net/dating_application_form_girlfriend.pdf
    • https://s3.amazonaws.com/kawotexulozax/65312064606.pdf
    • https://s3.amazonaws.com/zetituri/endometriosis_usg_report.pdf
    • https://s3.amazonaws.com/solonebosop/jasitato.pdf
    • https://s3.amazonaws.com/vuxagixil/31968210340.pdf
    • https://s3.amazonaws.com/lanubili/ddna_certification_study_guide.pdf
    • https://s3.amazonaws.com/sowewazulejewi/71438377925.pdf
    • https://s3.amazonaws.com/dumupa/how_to_load_washer_with_agitator.pdf
    • https://s3.amazonaws.com/rizijubovapuk/77165244305.pdf
    • https://s3.amazonaws.com/polexebuj/finders_keepers_consignment_shop.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_off0000f30f.bin
763082835c990a2308a65c0288dc04484b6b217424ff3f967463ed682028ea31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 5192 bytes
font_01_sfnt_off000104ac.bin
73cfd0d0d6a87534524dc35be608440f4e433f272104e85e968c4a8f2127c940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10356 bytes

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