Malicious PDF — malware analysis report

Static analysis result for SHA-256 0837837393acb3e6…

MALICIOUS

PDF

77.7 KB Created: 2021-06-11 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8bb9c8d03416d8ed73a7fd41ce069c6a SHA-1: 8044f94b51e9cb4fd7fbf02f67b378339d89dadf SHA-256: 0837837393acb3e6f854814d897f09bec912f97521acc5cc3785bc881c4f27c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and using UTM parameters, indicating a link farm designed to obscure the ultimate destination. The primary malicious URL, https://pixomot.ru/pbw, is likely used to redirect users to a phishing or malware distribution site. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/pbw?utm_term=partnership+formation+accounting+problems+and+solutions+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5fe32d25e2acb.pdfIn PDF document text
    • https://sumibudagat.weebly.com/uploads/1/3/4/3/134310224/damomo.pdfIn PDF document text
    • https://dapoxegimore.weebly.com/uploads/1/3/0/9/130969679/6525890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_60069d0dc0983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_605e095651c4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizunebapod.pbworks.com/f/h_c_v_full_form_in_hindi.pdfIn PDF document text
    • http://gobujirewod.pbworks.com/f/41163638215.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/w/file/fetch/144702723/62499721063.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144512943/vunedasujuvaxoloweragadi.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/what_happens_if_a_dog_gets_bit_by_a_centipede.pdfIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144650811/august_current_affairs_2019_in_hindi_adda247.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/zaxidusatutonazunetedaden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9abfb8-d56f-43f1-afb1-8c7b219b76e6/sig_sauer_p226_9mm_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a2b4cb-b1ad-497c-9db8-ec18a3bec9fb/88700634977.pdfIn PDF document text
    • http://gipovowi.pbworks.com/w/file/fetch/144821685/danefedezexadilevef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d937d50-d5c3-42cb-a903-7447bb3364d5/pivuvaraxojunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e23294-bef5-46c9-b89b-bbd2db5ff070/bible_commentary.pdfIn PDF document text
    • http://lewomirat.pbworks.com/w/file/fetch/144810462/zoxojirugebuzigoto.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/67622378494.pdfIn PDF document text
    • http://jazonewu.pbworks.com/w/file/fetch/144735045/67252789472.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 5712 bytes
SHA-256: 65feb110e01c1de3e2991fd10209b1ffcc31d1686a43a364f2e4f66d6ab4f065
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 11136 bytes
SHA-256: 3c436a8da0c6e3a6970f2b9c121019c29f3e9d9a05d93fae9f74ee7049c41768

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