Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc7c7d5412eaf7c…

MALICIOUS

PDF

77.8 KB Created: 2021-03-03 06:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1ac40e2a8da90873e9ae369ad73f1e04 SHA-1: fbc658e040ee09a10e60345d1f68d4e03279badd SHA-256: 6dc7c7d5412eaf7cdafd9b96c81a1be59d8472cb8539c70c1a746ed86774e199
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links, 'https://pelibifir.ru/123?utm_term=are+tires+cheaper+on+black+friday', suggests a lure related to Black Friday deals, likely intended for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=are+tires+cheaper+on+black+friday PDF link annotation
    • http://tulavesew.getenjoyment.net/composition_of_functions_worksheet_answers_kuta_software.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/g7Ehdjj/auralux_online_pc.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/68ee37fe257e.pdfIn PDF document text
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/8069586.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/vidubomufida-buwidasagu-burib.pdfIn PDF document text
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/vixekax.pdfIn PDF document text
    • http://mamontov-net.cc/bokepukexugubanawofx5nro.pdfIn PDF document text
    • https://fanokirala.weebly.com/uploads/1/3/4/5/134525579/5929788.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/fafawaboxikofefawifa.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/9125580.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/zijivevip/aristofanes_lisistrata.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/how_to_create_timeline_infographic_in_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/tubunoxezuvowukaxiju.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/wedding_gown_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/fitexomotumu.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_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 5540 bytes
SHA-256: 845a90dde66877f074f3a4cb86ce9dfc9cf96548bfd93b2a57ea3224f5a34a4d
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 10968 bytes
SHA-256: 87d0a1010c3ebf7c63bf047ec595641323b5793bfcda9daf9a209e614def6dbc

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