Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c88d9b50f567f6…

MALICIOUS

PDF

74.9 KB Created: 2021-05-25 01:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0263cf8f5d3ac8594084ea555696993f SHA-1: 9ded436e49e5454777df759a295d79ade0779bdc SHA-256: 58c88d9b50f567f61b14a02fa96933630244effd0691e01b013e091308916cb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on S3 buckets, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cdn-cms.f-static.net/uploads/4421360/normal_603fa1566c055.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4494138/normal_5fe0ce0642472.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/e8dea9ac9e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fc8c49a23bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_6056cff4b2668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_600a6861d7bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_60405cbb4756c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_6056d9f855717.pdfIn PDF document text
    • https://dexovepiniputo.weebly.com/uploads/1/3/4/4/134400909/muwozirime-wanemukezot-lulamekudit-lozevidasuninus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_60624e25729ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_606286ac842db.pdfIn PDF document text
    • https://junowebabozem.weebly.com/uploads/1/3/5/9/135965754/furizajexiruzos-jizomal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_603aa38ececbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_6023d77bce2a0.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/vugoremito.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/5d29e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bQ3nTxENlgE/wb?keyword=black%20and%20decker%20electric%20drill%20batteryPDF link annotation
    • https://s3.amazonaws.com/ponivotigegepub/nisoxakodumiza.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/wudazojosanalu.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/xemobipimagukamofajaledoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/video_helper_not_aggregating.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/que_significado_tienen_los_tatuajes_de_triangulos.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/lexaxorivazonijuguxigeg.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/tom_clancys_rainbow_six_video_game_series.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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5112 bytes
SHA-256: daaa22902bc0910308ce16dd5404a839bd375ab0f07a5717a96b470e565dee31
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 11612 bytes
SHA-256: d9b2181530f6174c01b84522adb0eaf985242afdffcacc4175a2ae36185cd7c2

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