Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca7d6094402599a…

MALICIOUS

PDF

74.8 KB Created: 2021-04-28 02:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 08087ec371dc07882a6dcc094e235b9b SHA-1: 25d6b62fd3417e2377ebde1682e84eda442c3df9 SHA-256: 7ca7d6094402599a6f117db7519ae2662c9a24629522c19e364d976f6bed3170
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing 30 external links, many hosted on disposable domains like atwebpages.com and epizy.com. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the structure suggests it's designed to host or link to malicious content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=absolute+maximum+shear+stress+example PDF link annotation
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/resubowotakosa.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/1fa29d1c.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/ddb6e958e44b3.pdfIn PDF document text
    • https://lonurosoriwe.weebly.com/uploads/1/3/5/9/135985322/jujidon.pdfIn PDF document text
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/6d97cc82eb3d8.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/kugilazuremefe.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/best_math_workbook_for_5th_grade.pdfIn PDF document text
    • https://fodakapi.weebly.com/uploads/1/3/1/6/131637942/vosut_kexowodib_guletozenewik_buxoko.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/fegem.pdfIn PDF document text
    • https://niwanokanu.weebly.com/uploads/1/3/4/5/134592400/7301228.pdfIn PDF document text
    • https://nugekiva.weebly.com/uploads/1/3/5/3/135322430/59f71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/grade_4_grammar_lessons.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/mimas.pdfIn PDF document text
    • http://bikaduwixunu.epizy.com/what_is_ancient_greece_democracy.pdfIn PDF document text
    • http://molujafit.atwebpages.com/35552433896.pdfIn PDF document text
    • http://sejekowosabukog.epizy.com/noriwiwomuzixowowi.pdfIn PDF document text
    • http://roranirit.epizy.com/rewuboropurubududuveni.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/75897428697.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/entrepreneurship_books_for_b._com.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_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 5256 bytes
SHA-256: d53af2e32ba7088860b8784d1c45671ee36cfacfa378c6780aa18a37b5f3a7cb
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 11796 bytes
SHA-256: 2ec9f602b7e63afac254afe0d6667f595762a6e345ffffe938580c0c3ee31150

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