Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bdc55037cfd7c8…

MALICIOUS

PDF

75.9 KB Created: 2021-06-02 14:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f00f82de6d0564868cb6bd8223bf2849 SHA-1: c86f66e7af6e65fb2c5a2e8b7ad2e3771702c71a SHA-256: 80bdc55037cfd7c8d227193db26dd3d3471dca274fe7ecbfdaba91dc0e4d63a0
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 0.9993

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://dugedepap.ru/123?utm_term=passenger+let+her+go+guitar+sheet+music PDF link annotation
    • https://katebobuwusa.weebly.com/uploads/1/3/1/3/131384636/nobatizo_lagefotipawaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_604f2c1cecbaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_606757a5d72a7.pdfIn PDF document text
    • https://neninexi.weebly.com/uploads/1/3/4/7/134714879/1cf500827615d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_6023d501887fd.pdfIn PDF document text
    • https://wenibowefopari.weebly.com/uploads/1/3/0/8/130814001/kijotidiwerejapoguw.pdfIn PDF document text
    • https://milakixu.weebly.com/uploads/1/3/1/4/131483020/wusejofofowalug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_60244aaa945e5.pdfIn PDF document text
    • https://kibimibenafozo.weebly.com/uploads/1/3/5/9/135979164/gopotepejijasuw_jogomibedun_sufaloluw.pdfIn PDF document text
    • https://zaronubiguxade.weebly.com/uploads/1/3/4/6/134685024/f8d40ada3473d.pdfIn PDF document text
    • https://jowojebutoda.weebly.com/uploads/1/3/4/4/134487303/jomosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_60216f420443c.pdfIn PDF document text
    • https://kezorida.weebly.com/uploads/1/3/5/3/135330530/fipidi_zupenaf.pdfIn PDF document text
    • https://rixolojujosu.weebly.com/uploads/1/3/4/6/134622111/kazuwijuzok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_6020270f9f9b8.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/3334265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5ff7c7965d911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_6019c31e9eef5.pdfIn PDF document text
    • https://kejidelevotina.weebly.com/uploads/1/3/5/3/135326148/bazejewufojixejot.pdfIn PDF document text
    • https://nijupafubowawiz.weebly.com/uploads/1/3/4/0/134012726/pubarofavowanegikin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144483750/tatezedubefe.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/interpreting_double_bar_graphs_worksheet.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/blockman_go_mod_apk_unlimited_money_2020.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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 5216 bytes
SHA-256: 7bfd33d2906700a77cab49e2471738c6f8ca5441666c5c23b7757f6004610165
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 10236 bytes
SHA-256: 2055ef5a35750900ee459d08ebbe22164938a376a3b6fbae01ddd0111aa47ca5