Malicious PDF — malware analysis report

Static analysis result for SHA-256 e016bc0a44ef12a7…

MALICIOUS

PDF

121.0 KB Created: 2020-12-14 04:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0c757159faccc44eaf4057b96592c170 SHA-1: 2a90ff59cc8f7a2801c6cae58089d79830258227 SHA-256: e016bc0a44ef12a74b672cdb1bd1d7810658f77c3debddd341c6434c6974c1d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=neon+genesis+evangelion+episode+1+summary PDF link annotation
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/323110.pdfIn PDF document text
    • https://tufupuvakasu.weebly.com/uploads/1/3/4/3/134310035/ruwadurifujade_majubesufekipo_padijonapufibib.pdfIn PDF document text
    • https://pifelisadejo.weebly.com/uploads/1/3/4/8/134884126/weginedonenux.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/3508313.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/44fface.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/lawasaxagitovusufi.pdfIn PDF document text
    • https://lakalenavis.weebly.com/uploads/1/3/4/3/134313358/luluso_fefijaderafem.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/jevedijadiki/24282394975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b55dbf-edfc-45a2-bbca-5b1f35ac7956/nimovaladim.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/50835139865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9a555c-4d8b-4795-8b19-2adb6bbccacb/32563141281.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/dead_parachutist_lord_of_the_flies_symbol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8a24f2-f612-4ff5-9372-7b7328675da0/90348910658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe20490-cd6f-4e0e-bf15-8c575da8b29d/kexuker.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_off000139ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EA 32028 bytes
SHA-256: 3820b8698d0bb8c376356a3f8d9ba707e315fec9e4897ab5c6e8625f1f76717c
font_01_sfnt_off00019dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DBF 5460 bytes
SHA-256: bbbd436a118ac192b88cc79ce0d68b8e75e72009c0bbe7aa82445f833b91e96b
font_02_sfnt_off0001b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B059 11408 bytes
SHA-256: 2ca1a6dd883e1fde1127afd7397f35fdf8f9ffb93e088706950235d3d4c91df3

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