Malicious PDF — malware analysis report

Static analysis result for SHA-256 b808631fbf9144d1…

MALICIOUS

PDF

83.3 KB Created: 2021-03-15 03:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0109d1d530b09577a7dc94c6c11eb2ac SHA-1: 893c573187c552263c762863a98ac2c261c7310c SHA-256: b808631fbf9144d1bb800d6aecb93f16143634be11d5452b4b1dfe62c46ea1c6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one prominent link to 'maypoin.ru'. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The embedded links likely serve to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=black+and+decker+7+1%252F4+circular+saw+7391 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383923/normal_604656d9e0ec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5ffdc21543799.pdfIn PDF document text
    • http://jevufoduxixan.22web.org/59154841327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_5fdc4f8734a6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_600f5e8d3bc32.pdfIn PDF document text
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/pikutej-pifutizebufak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fcdd124d4796.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/xisapujodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3463e7a3-68f7-427f-b0c5-027f91e4d0c2/detomibefaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e9e495-d1c0-42f6-ba0e-bd97b6103be7/how_to_start_a_computer_repair_business_reddit.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_0f5d63a4d22940c0a1367ea02ca6a847.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c138012-43ca-49b1-aedf-c154a12e0311/commercial_ice_cream_maker_reviews.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_cb50e3787848464eb92a07d1c336f291.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b826f41f-ae5a-44ef-a0ff-c2c8fea11c27/llamadas_telefonicas_roberto_bolao_analisis.pdfIn PDF document text
    • http://genenapukiral.epizy.com/80667469917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e8f3e4-3624-4201-8810-ba179975911c/tuzogok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f775e5ff-5576-4df5-ba78-9d183d8bc3ce/spanish_to_english_translation_app_free.pdfIn PDF document text
    • http://sowumularuro.epizy.com/advocate_personality.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_7bbc452c4bad401fa898312bfe745a55.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_bb539743902342e3bbb91c8bae7d72f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e563b417-ca8a-4cab-b5f5-2596a2ef7902/how_to_pass_algebra_1_keystone.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_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 5716 bytes
SHA-256: 0426568c5e203246be541291b4b2a0848c486463ea8bca67e1af8bf09661027f
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 11576 bytes
SHA-256: d3c4b22959fd326c47e71d099afe941e2e2cbebabb91853d9c9a7a5c43f93582