Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37a42147c656431…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 00:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4c694f2a106c201fcbeaff9cebaf84be SHA-1: 546d81e811f9af1ba4d57698d935332acbe4cd90 SHA-256: f37a42147c656431139239e6c696c2c852a0e0e185e89b3992958003dc4c2256
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=abrash+black+book+pdf PDF link annotation
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/3715154.pdfIn PDF document text
    • https://fofumugu.weebly.com/uploads/1/3/4/4/134445246/xejasozosiri-kupomidovu.pdfIn PDF document text
    • https://dilazewinu.weebly.com/uploads/1/3/0/9/130969594/8785812.pdfIn PDF document text
    • http://rujokevawevi.22web.org/naginibegisuleketu.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/suxurekezopub_bavevijani_muvano_sonijawodejogot.pdfIn PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/berazorezijilan-muwesofalukez-fujewovifada.pdfIn PDF document text
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/7184394.pdfIn PDF document text
    • https://sozefusezat.weebly.com/uploads/1/3/4/8/134860931/tipid-puxufapamirisa-pudapujutofawu.pdfIn PDF document text
    • http://vojupobakovax.iblogger.org/john_eckhardt_prayers_that_activate_blessings_youtube.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/referojofiwawojizuru.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/dark_souls_3_wolf_covenant_location.pdfIn PDF document text
    • http://baboguzaxeleju.mypressonline.com/bofonefefex.pdfIn PDF document text
    • https://tosafesixagosug.weebly.com/uploads/1/3/1/3/131383933/bupulawazajoti.pdfIn PDF document text
    • https://rovizefodizare.weebly.com/uploads/1/3/4/3/134309954/puvidu_nixonipipudites_kadupakekogino_toxisola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_0d284030b89d476f8d1ec3971f1ee226.pdf?index=trueIn PDF document text
    • http://tadidej.rf.gd/sodidijoxafurozimafilu.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_7b324d65dc5343d6b9dbc639ffb50440.pdf?index=trueIn PDF document text
    • http://sevidimifab.epizy.com/wugituvijal.pdfIn PDF document text
    • http://pixipisifoxuj.rf.gd/pajavotugumut.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 5436 bytes
SHA-256: 138c4f1b53e270797a83ba1df6daed32c81a821b1a34d2ec3e1e4c3126af2aae
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10424 bytes
SHA-256: 25d097dddf1f079d9885b6020792945b0894c854938419913b286c84f55a07e2

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