Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfdb6e3d6da64b5…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 09:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e26a7ca74dee3af8d5fadb89a3ab532b SHA-1: 92117357f4fa87b8c7dff294c4f080c9e4b90ac1 SHA-256: 3bfdb6e3d6da64b54ca9f5cbc41dec2f597cbde043064bdf47647cc740931b24
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or SEO spam document. The presence of 'LOLBin token sequence in document text' and numerous external URLs points towards an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6687

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=cavum+oris+pdf PDF link annotation
    • https://cdn.sqhk.co/xawobovuji/Zjbjh62/beard_grooming_kit_amazon.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/how_to_calculate_dividends_paid_on_common_stock.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/iidvXhi/68612396645.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/wehdujj/62618253696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_60235816a3f96.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/77ef369b791d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447267/normal_5ff17ba341846.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/fyrQDif/xerirejomunutolefibuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/iajajeL/minecraft_live_2020_mob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_602d9269a4845.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/Thfghjd/mens_hairstyles_for_curly_hair.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_6038020b3ac77.pdfIn macro / runtime command snippet
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/tomapoxo_kizir.pdfIn macro / runtime command snippet
    • https://paxexituva.weebly.com/uploads/1/3/5/3/135332474/8644219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_6030791e29d3d.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/AidjiAI/vufaximenuwafonewapuzom.pdfIn PDF document text
    • https://nodirodenesubob.weebly.com/uploads/1/3/5/9/135986245/3f42e6dcabacdf1.pdfIn PDF document text
    • http://surupumigo.mypressonline.com/treatment_manual_for_anorexia_nervosa_a_family_based_approach.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/Rii1nxN/vibopunorowojegonume.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/easy_scientific_method_experiments_for_middle_school.pdfIn PDF document text
    • https://kijabejinal.weebly.com/uploads/1/3/0/9/130969506/3e83a9.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/ibhbSha/naremib.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/75567313252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewimidofi.epizy.com/birirekaxuxakepasarodufas.pdfIn PDF document text
    • http://gevitejivojo.rf.gd/sedentarismo_2017.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/resumen_libro_ciudad_de_las_bestias.pdfIn PDF document text
    • http://pezamax.myartsonline.com/12123308555.pdfIn macro / runtime command snippet
    • http://fopagozijudiri.epizy.com/47223808442.pdfIn PDF document text
    • http://tiwojojerat.rf.gd/befikra_song_tiger_shroff_mp4.pdfIn 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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 5120 bytes
SHA-256: 62deab7f34b96c4276fa33ab004160ad674d3c79a2ea6918298fb87ea6e42a60
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 11724 bytes
SHA-256: 9c9bd06cae54dd7a8257a0c7605e0550b9f24f08f550a845fc4f92731dbb24c7

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