Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b3c79b06763ff0…

MALICIOUS

PDF

82.9 KB Created: 2021-02-21 13:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5df32f11e366497c19bf49fe397573e8 SHA-1: c15a545881b68c3b70fad1480b8f3e3b6f9ff2a3 SHA-256: 52b3c79b06763ff0b5a061330a8cd3598a3424a466f43e06f319e5636eb64518
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to potentially malicious domains, and the document body, though truncated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://jacksth.ru/wix?keyword=a+love+to+last+june+7+zodiac PDF link annotation
    • http://useplafond.xyz/zombie_catchers_mod_apk_unlocked_all21yrq.pdfIn PDF document text
    • http://wwnews.site/987308445119oig0.pdfIn PDF document text
    • https://zotamitogimida.weebly.com/uploads/1/3/0/7/130775261/resudanufi-disasumige-xafefikula-wubogukenonewej.pdfIn PDF document text
    • https://laxatutokowo.weebly.com/uploads/1/3/5/3/135387201/nisuzo-dumagujuwikoraf.pdfIn PDF document text
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/fipiwudefaza.pdfIn PDF document text
    • http://iwhite.space/zatofabawometbt1z.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/JhgjjaL/17319158288.pdfIn PDF document text
    • http://thesimplycompleteseries.com/thoracentesis_and_chest_tube_differencei2zpl.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/fatisake/whatsapp_story_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/bomb_squad_pro_edition_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/charlton_fc_football_ground_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/wadevejisotomuwabedu.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/cast_away_2000_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/home_depot_sheetrock_joint_compound.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_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 5092 bytes
SHA-256: ad54139eb7836300e1a86b306821dd52c192934596e7f3906d8aa723ab983397
font_01_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 13932 bytes
SHA-256: ade07e2aeec9de50da42d2e29e0bb5309f23df104eae3e4a8e7905baa3d4d771

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