Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb82c042aac6521f…

MALICIOUS

PDF

68.5 KB Created: 2021-01-05 04:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 924a0aa400331cd195824934fe75a390 SHA-1: 3a6b1cfcd4b6ad0741890713ce50a372d04d77e3 SHA-256: bb82c042aac6521fa85e25cdb4ebec0cc6618ab6143f5b2501c38748917e3110
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many pointing to disposable hosting services and redirectors, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=au+train+river+fishing+report In PDF document text
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/853868.pdfIn PDF document text
    • https://xupatoxavivuni.weebly.com/uploads/1/3/4/6/134615471/2656343.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/vivosit.pdfIn PDF document text
    • https://luxanuritaz.weebly.com/uploads/1/3/5/3/135346697/2208270.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/ghhjggV/81798254157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402289/normal_5fce2628ef54d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fcf43b83b01e.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/ibvgdV6/plants_vs_zombies_2_free_download_popcap_games.pdfIn PDF document text
    • https://tuzisufuga.weebly.com/uploads/1/3/4/4/134458332/7544987.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/foxifupisefede.pdfIn PDF document text
    • https://xujajogasugoni.weebly.com/uploads/1/3/4/5/134514057/wufudisiwaxojud-vifet-pejudoxedijale-dababuxudebixis.pdfIn PDF document text
    • https://powilumoratome.weebly.com/uploads/1/3/4/3/134368047/gijafuvulalobo.pdfIn PDF document text
    • https://mudituzeko.weebly.com/uploads/1/3/0/9/130969310/43ef5f0c71cac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 5180 bytes
SHA-256: 91546bcb7f718481085850b6563f0ce49e33b3abca0805c7b4561259d79df72a
font_01_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 10668 bytes
SHA-256: 9861c6f23fee4e8a6071649e9dd1b35633ea622b654b68b71c4b571d6f9c559b

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