Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e4055a0b4715e6…

MALICIOUS

PDF

73.0 KB Created: 2021-03-29 12:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78d8d294f4c825983a84bd3123959789 SHA-1: 4e6d0eedecc2a392ee9749367135727761a46cab SHA-256: c2e4055a0b4715e69619c6bef4e60d7828e78905340e6bd8eadef59fd8c0a6d7
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 domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, with one external URI pointing to 'https://mezovuduw.ru/wix?keyword=blade+and+soul+optimization+guide+needs'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wix?keyword=blade+and+soul+optimization+guide+needs PDF link annotation
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/95643dd.pdfIn PDF document text
    • https://golobixapisiz.weebly.com/uploads/1/3/4/6/134653183/saduxofoxoguvawised.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/religagebib_majoteruzorudi_vufamibaxowot.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/7885673.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/5874767.pdfIn PDF document text
    • https://benuwefijazom.weebly.com/uploads/1/3/4/8/134897428/niwafavas.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/sodixamim.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/wafolakavobi_nulegi_disixapo_dawejibuma.pdfIn PDF document text
    • https://bekiwoxutoga.weebly.com/uploads/1/3/2/7/132712348/nofodoj_wokotag_xefuduj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/latufenaw/vufozag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cc7ff9-c2a8-4b77-a854-7f205ff133e2/hymn_to_proserpine.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_4f9896879b81410b983e84fc013e4271.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35d488b-a3ab-46f5-86bc-ac3b84a3c8bf/how_fast_does_a_125cc_pit_bike_go_in_mph.pdfIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_0c02194b245b4aaeb3cbe76af1c259ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca1bd5f-0944-458e-9499-1da3cb74e7a1/busufowitoti.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_848aa360c03743acbfc0deae9cd91578.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bc840c-2578-4ac5-afba-5de79dd155d1/56132707408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ef8122-f3c7-4035-829e-266ab15a5ee7/dabofupudodatopomaloselo.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/joledesuwoxowawurimegam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33e5ae4-26d0-472d-a8b3-3dd5f8d1fcbc/mazojunol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4aa7e2e-545c-42f6-b040-d63057ed26ae/gadesibepovuto.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/paperigigagadobovijafopok.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_7dabeaa53607405ba45f8d014267a5f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39b0b46-76d4-40a0-8372-a73668d432b8/20797526731.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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 5284 bytes
SHA-256: 8a92100814a87c8622effe86a3527f248f1f418b3e738d267804a09a8066e705
font_01_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10356 bytes
SHA-256: 0a2cf76250eb582a9298e9491c8489defd938888958c505878449fa59c291a21