Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7afc4d2bcf96d5f…

MALICIOUS

PDF

75.2 KB Created: 2021-06-09 22:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1e6657ec2b251bab69e9a79563fb11e2 SHA-1: 522da25d6ccdaa97476ec3ad8288589ae8621e52 SHA-256: b7afc4d2bcf96d5fc56e752183b2d225b31c8319852f3aa25f185419488b2d24
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with a notable one pointing to 'https://queure.ru/pbw'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm on disposable hosting, further supporting a phishing or malicious redirection scheme. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://queure.ru/pbw?utm_term=base+th+11+hybrid+2020 PDF link annotation
    • https://sudejija.weebly.com/uploads/1/3/5/3/135390998/05af0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_6024fbb5e8749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd638c03cd30.pdfIn PDF document text
    • https://mekivigabu.weebly.com/uploads/1/3/4/0/134096936/takeguzemopedaz-xolidiv-xaladusid.pdfIn PDF document text
    • https://wovanawobudiw.weebly.com/uploads/1/3/5/3/135332940/mexatelekeliwabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_6013cb87d7e68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403683/normal_6001f4da6768a.pdfIn PDF document text
    • https://wopewajut.weebly.com/uploads/1/3/4/6/134664352/dab0c42e25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6059fd94c59c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fffc3c2750cc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4378605/normal_60b06ac557673.pdfIn PDF document text
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/jokajazubiwopej_galesekivabamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5ff41130b9934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fesatisobif.pbworks.com/f/mini_militia_pro_pack_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e659cb8f-3c76-41b6-9193-4103a18bed94/philosophy_the_power_of_ideas_10th_edition.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/81681252557.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144569688/vixabavuwidena.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/saregama_carvaan_tamil_songs_list.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/bagagozutilifonibipa.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/how_to_calculate_dividends_for_common_stock.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144417096/wagen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fed363-d2ad-40bb-a711-20505430e09b/autocad_electrical_course_online_free.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_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 5500 bytes
SHA-256: 31fc0fd7f88477b5825a45fb3b8d90ec87eb52b21c800bdb3b8aa5a278d6c914
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 11088 bytes
SHA-256: efbff428af83624cb236201b62769cab01db0776bd9409045e3dc664e6055b9b

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