Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50050603bf7da77…

MALICIOUS

PDF

84.5 KB Created: 2021-02-19 22:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ad7e85ce6203fe8e504a0bd6935f51b SHA-1: 7c1855a87382b1bfe8249038252def3181c91e60 SHA-256: f50050603bf7da77f64583bf18a2a70a61b0ef0a054f5510688fd658e410b837
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of external links, indicative of a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_LINK_FARM heuristics suggests an attempt to redirect users to malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=how+to+report+regression+results+in+table PDF link annotation
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/vikizodusoluvowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_600e6782ad886.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/3268513.pdfIn PDF document text
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/929361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_5fdb100be1eca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_6008f763c5e6b.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/69d3083983d4287.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/fumibibal_navoteji.pdfIn PDF document text
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/7213551.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/loxokiwawemuvep_namumubode_rewid_puzonupaxavoje.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/lixuduwonifa/79127638431.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/90963826148.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/nojawitodeb.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/similar_shapes_and_scale_drawings_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/dr_browns_natural_flow_bottle_warmer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/baldurs_gate_dark_alliance_gamecube_iso_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/16425138433.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/gedetamarij.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/nexaf.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/dedazuzenanabigowizaruvul.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_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 5180 bytes
SHA-256: 36dd53272d6066164e292696c3cdbd1f1b5a55bf57875d385e84d2ce83afdb02
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 12188 bytes
SHA-256: 407fb26affb129eb0e52d08e87556636a4c6747c76384b7d8d6095183015e1cd

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