Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6a494d984b89a9…

MALICIOUS

PDF

69.4 KB Created: 2020-11-17 18:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 23be2ce0e715242a663b7947614a969c SHA-1: e511d805c1c7171b22b8a46b8365db3963c00ca9 SHA-256: 4b6a494d984b89a90d6a9eb79a3550a78e00ce1abe808be2493144438ea02de8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on S3 buckets and Weebly subdomains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious 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://trafficel.ru/strik?utm_term=python+export+to+excel+multiple+sheets PDF link annotation
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/3822842.pdfIn PDF document text
    • https://kidofepakanuzok.weebly.com/uploads/1/3/4/0/134096393/9405813.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/dufudotu_mekexenuremaz.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/varolexexus/10435497773.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/median_of_grouped_data_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/ark_snow_owl_saddle.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/benetijinofumep.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/sat_test_times_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e975ae-118b-4e71-b978-76b6334c68e3/lediposazenixo.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/duck_life_tyrone_gaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b5eda3-0c82-4351-ae42-5e58ca157abd/50709788363.pdfIn PDF document text
    • https://s3.amazonaws.com/madegusulepugif/mrc_image_format.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/65328583550.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_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 5016 bytes
SHA-256: 6dac680d10ee9a6433e21174020e152ad27af9d9beecfe0275e04646d7f07652
font_01_sfnt_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 9688 bytes
SHA-256: c9d7bdfbcc4e072b6e277f7eb96b5a46809943212cc423dd60e0790997189b1e
font_02_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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