Malicious PDF — malware analysis report

Static analysis result for SHA-256 556dac3fc8194fb6…

MALICIOUS

PDF

81.8 KB Created: 2021-03-28 06:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3267660bd9e2d231634ea768a29e3f44 SHA-1: 8360f6c4dd39c0f752e52cc4afb6e7c9cb0441e2 SHA-256: 556dac3fc8194fb66a0cad905d3e3a277e4c7afda57049f2a8eaf55a86a33d0e
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://resalured.ru/123?utm_term=facebook+front+page+template PDF link annotation
    • https://cdn.sqhk.co/murajefovel/YTjcL85/black_label_app.pdfIn PDF document text
    • http://creamwalls.space/the_goat_who_is_sylviarw56t.pdfIn PDF document text
    • http://idealsit.space/permisso_de_deus_andrea_fontesm4vo5.pdfIn PDF document text
    • https://vidigesiwixir.weebly.com/uploads/1/3/3/9/133997627/746468.pdfIn PDF document text
    • https://cdn.sqhk.co/tifatuju/7tVibnh/iron_bottle_opener_anniversary.pdfIn PDF document text
    • https://midezotadodagof.weebly.com/uploads/1/3/5/3/135326840/tekigitox-bonodowotogot.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/jemam.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/5b28733c0.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/idjbzSO/zarchiver_app_free_download_for_android.pdfIn PDF document text
    • http://eslife.pro/tofapoxodawjhdxd.pdfIn PDF document text
    • http://hotita.fun/23149683595ipw65.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/f6jjXhd/taylor_ducks_basketball_schedule.pdfIn PDF document text
    • http://usacreditcheck.info/add_and_subtract_fractions_with_like_denominators_practice8ibcg.pdfIn PDF document text
    • http://mazafaka69pussy.online/62059127691fexze.pdfIn PDF document text
    • http://hs-life.ru/micca_speck_g2_remote_appx61e7.pdfIn PDF document text
    • http://useplafond.xyz/5017847943e9w13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_8673e6cc8a8040ba8b4a4832619649c8.pdf?index=trueIn PDF document text
    • http://wazezijipesu.rf.gd/the_virgin_diet_breakfast_recipes.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_a40cf6e3fe374bdf891b7b37c6124856.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_a2fe324c59ad40b2a9e3ee7555b52c58.pdf?index=trueIn PDF document text
    • http://sabodivatipapan.epizy.com/27089475285.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 5316 bytes
SHA-256: d38ef1e71744f348738b9387b739a5029632f798ac7cd8e30b00ae4c705d0370
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 11392 bytes
SHA-256: a52c8c4d22d2d0c47c447ffd17bcf9bef6005b9cb85790c37e70578bbab28ef0
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 16364 bytes
SHA-256: cb5475aab49de77085167d498647f6369a7d83608b67ce023d416f998a07b807