Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ab40ab3d1858f7…

MALICIOUS

PDF

80.3 KB Created: 2021-01-31 22:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 46848c5b06a3a4ace9f30f17ab2910ae SHA-1: 70b2d49fc7033d64055050745d215ff2534fe84e SHA-256: 35ab40ab3d1858f77a9bf1dbc6b5d830dfe9e395e34b978ea4b26d23b4d1a1f3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan payload delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious sites, potentially for credential harvesting or malware download.

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/aws?utm_term=tiny+archers+game++for+pc PDF link annotation
    • http://xujilutobidiko.iblogger.org/baseball_card_template_google_slides.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452852/normal_5ff4a5d7ddde2.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/hhBXuYq/chocolaterie_stam_locations.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/7968bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5febefee7a51c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467601/normal_5fcd5b7e458be.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/sesufun.pdfIn PDF document text
    • https://fexipipovunozem.weebly.com/uploads/1/3/2/6/132682859/sibeluloz-ruridumeguwe-degekovilap.pdfIn PDF document text
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/fdba767816945a.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/5gjh5Ra/smart_tv_sale_32_inch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5ff66c3ce194b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5fed9cf589614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd12c35663f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_6014a3f70631e.pdfIn PDF document text
    • https://cdn.sqhk.co/buxisinuji/jgkFqBz/ice_age_village_appvn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_600f44e0e2249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_60058fb4de43c.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/mokuwanibof/57149717869.pdfIn PDF document text
    • http://lesodabat.epizy.com/unity_2017_asset_store_location.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_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 5448 bytes
SHA-256: 7f7f15503e307e817baf85103514f15d2c5b413f993c0638e1e00cea4dc19f9d
font_01_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 10816 bytes
SHA-256: da6a095f4d3ba4760c84499b95088577f70ddf8f9e3c1244de4922b5a2121978

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