Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18fe167a28d2f18…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 05:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8ab441bf228ba52bf76e2bb9c4ec1a38 SHA-1: 16a13005076879bb82ba508c057e5055fcf2206b SHA-256: e18fe167a28d2f1889ffa13869f895690f05ada0016874cbd1bda3e3ef2a92f6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. This suggests an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=change+management+theory+pdf PDF link annotation
    • http://blockingscenery.com/lobasigusekatozavomuo5hhr.pdfIn PDF document text
    • http://ewop.space/diy_throwing_knife_target_boardwhupd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_60251aef7372f.pdfIn PDF document text
    • https://paseruvuweduzuw.weebly.com/uploads/1/3/1/4/131437476/80dfdebdc6.pdfIn PDF document text
    • https://jewafime.weebly.com/uploads/1/3/2/6/132681773/lopagas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fcc2b2971c01.pdfIn PDF document text
    • https://vipigenomunopem.weebly.com/uploads/1/3/1/3/131398348/zidikanebago-gometenudifod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466151/normal_5ff33455cbe53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414696/normal_5fe4d8b79a20f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ffa3fd4d9328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jevelel/53519191442.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/printable_roman_numeral_clock_face_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/vedovujajajimapoku.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/john_kenkel_analytical_chemistry_for_technicians.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/appsc_group_2_notification_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/pedigobejumuzonofumigamig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 5112 bytes
SHA-256: bd663511226fbb4e198720c2b55a0bf7fb8d3f32fbd32da6c316ae391b507060
font_01_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 9904 bytes
SHA-256: db905efffdf78140b523124f47163f932e32f7ec8d8edbece9a8aa822b8dfaec
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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