Malicious PDF — malware analysis report

Static analysis result for SHA-256 9946c60bda925c36…

MALICIOUS

PDF

90.7 KB Created: 2021-03-22 00:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2da6b85634f769df24de7182639a8726 SHA-1: e2c45efb2ff5b7ea30711d0ac7770b64a59890c6 SHA-256: 9946c60bda925c364a96df32bfa5b4368c5f18a4364d64cf311156f9a987b749
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on services like sqhk.co, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/award?keyword=free+piano+sheet+music+pop+songs+pdf PDF link annotation
    • https://cdn.sqhk.co/tevunufoba/gdotigy/41126471362.pdfIn PDF document text
    • http://czecheducation.space/teaching_young_language_learners_pinterwq2ax.pdfIn PDF document text
    • https://cdn.sqhk.co/tikatonasa/lT86jig/ultimate_shark_simulator_apk_aptoide.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/ruraj.pdfIn PDF document text
    • http://dkblogin-de.com/rigirosuravovavujilosini9o2kr.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/geaL5jd/xesavojovomisegoko.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/geiephd/pirexaxomemuwasemad.pdfIn PDF document text
    • http://xadexawufomovi.sportsontheweb.net/38782268507.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/zuzalofuwedeli.pdfIn PDF document text
    • https://zuxivojeduzudog.weebly.com/uploads/1/3/1/3/131381782/bazitajimesopo.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/jhejaYQ/38431472576.pdfIn PDF document text
    • http://bio-ita.fun/what_fast_foods_have_gluten_freek224p.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/ahgbbje/business_insider_france_wikipedia.pdfIn PDF document text
    • http://morj.space/fuxoxefawatwg2da.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/ccb19e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/how_to_apply_for_hdfc_preferred_customer.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_36661fb6786a4f619556816fc353575a.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_eee3a4af592f4f2d8a40016b3e3003de.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_b1ab85725ed243d5ae4788f7c185065b.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_4627598fa8d54520ac58876bc56f3919.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_dc9fea3269144281b825ebe3e3f29315.pdf?index=trueIn 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_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 5492 bytes
SHA-256: 08417ad7cea8b868947f0d0c9591a51d25267e2362ca9a03d6f2f4b36845b4df
font_01_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 11360 bytes
SHA-256: d59a17f76fde9878def1cfe57387615c69b3be6f9fcc65a8891b4b2f7be67724
font_02_sfnt_off0001484e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484E 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52