Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a4482d99f7ee6c…

MALICIOUS

PDF

96.3 KB Created: 2020-12-08 05:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52dedf3f4c8dfca7600d7cf3a36f31b9 SHA-1: 749b01562ab7eda80722ab3b8c77bd860afe57ae SHA-256: 53a4482d99f7ee6cb23983895852f7a9741fce9422208b42435022e41d6e4f8d
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a link to a known malicious redirector infrastructure further supports this. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://gettraff.ru/strik?utm_term=mountain+range+map+north+america
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/linabukoburamezexu.pdf
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/7373975.pdf
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/punosa.pdf
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/9500420.pdf
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/8f906a08e.pdf
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/7085946.pdf
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/8001545.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/7766472.pdf
    • https://winofugunolef.weebly.com/uploads/1/3/4/8/134846497/5877464.pdf
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/selulosa_nijusoganimulo_xixonugoj_sowalijanolafe.pdf
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/9039740.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/4418284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e9036b97992eb55c1f46/t/5fc31da99b1ed03538433210/1606622634818/swordsage_3.5_stances.pdf
    • https://static1.squarespace.com/static/5fc07dde27a199023ab34438/t/5fc4705318e72e5fdb66c6b9/1606709335702/great_dane_lab_mix_size.pdf
    • https://static1.squarespace.com/static/5fc153656609fd0ee79445da/t/5fce5021920f47545bc2ec20/1607356450576/freeze_warning_tonight_atlanta.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013adf.bin
33d120fb9295a9fb3095c6f6347f2546419e48d07360f9046a190a9594fdf50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 5140 bytes
font_01_sfnt_off00014c42.bin
631ad38b5b6d3070b86dd0a0fa8fb7122bc042ff66bfdab1c4598ef4a146c18b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C42 11736 bytes

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