Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73b5ab6441a23ae…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 07:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: daf146cb5cc6ed9392479281f04f08bc SHA-1: 118d060c061d273468f716d988d2cd16044766c7 SHA-256: c73b5ab6441a23ae7e34329b4fd03b82a80aa74a6979a7f302b7dac80529ce7c
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, many of which are to benign-looking PDF files, but one prominent URL, 'https://xezojetit.ru/award?keyword=differential+geometry+and+its+applications+oprea+pdf', is suspicious and likely leads to a phishing or malware distribution site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a link farm designed to redirect users to malicious content.

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://xezojetit.ru/award?keyword=differential+geometry+and+its+applications+oprea+pdf PDF link annotation
    • https://togijiwasifuva.weebly.com/uploads/1/3/1/3/131398416/9946344.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/2963725.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/gezixusesojuk.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/4851820.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/7684579135.pdfIn PDF document text
    • https://wazurewimi.weebly.com/uploads/1/3/4/5/134598950/202804f2bbfb8.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/2750131.pdfIn PDF document text
    • https://wowevabesal.weebly.com/uploads/1/3/5/3/135322278/doduxevuxawadi-mafitu.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/ap_seminar_imp_rubric_with_scoring_notes.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/sudevejerifu/always_on_display_android_9._0.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_47856c0cf2d145059e59d71825344b24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/zezigotifuj.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/61081603774.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_db56b98e10bb44f586b91e385aed80b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/jiguwobutedetirir.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_2536a098340f4302a3b03ab323d1d7d8.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_500a6a2fc8e945f7ba28838907e5ed63.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_60e09aa5993c47328db772e3084480ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamovagag/kosazazagekud.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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 5576 bytes
SHA-256: 29ca718ab2007110a1db7b6e9d2eb3915cda80b8af1ed50830502ad346ae9e16
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 11108 bytes
SHA-256: db5ac78981cfabcfd77acc8885fb1f36822ed07b6be9c18ddb80a03de6c65f13

Open this report in the interactive analyzer, or submit your own file for analysis.