Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdacf28e62518bd8…

MALICIOUS

PDF

80.5 KB Created: 2021-04-03 16:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ba26677861328ea361bd6f73e9ccd77a SHA-1: df2e9e5746d2ea49d305cd9fdff3ab3e1aabdb70 SHA-256: cdacf28e62518bd82f830a0552d01fed3a2dd03fc4f2290ab17d6f3c3a72335f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary malicious URL identified is https://soxebez.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/strik?utm_term=why+is+the+internet+light+off+on+my+modem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464529/normal_5fd1117de22be.pdfIn PDF document text
    • http://wegasanapifare.iblogger.org/mipazajixesik.pdfIn PDF document text
    • http://seluluxafej.22web.org/badapepiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5fffd90f7c78e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_60579f3b6b8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_602e80441462e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_604070bd1519d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_d17463a8b9034056bb4e3b75edcc2d0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zexozavo/zezikujakoratamanij.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_ec530003ff164dfda2ed831c748cb9e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad496356-7671-48c1-bb51-29c32278a0ea/fafomavewigugituw.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/beats_solo_2_special_edition_gold.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_13d79288cca14481bb4620bf667e2aa1.pdf?index=trueIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_26d423b851d74175894b7b833a586f2a.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_ec5eb4c10a714dc0abc8c89fc809743b.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_e6b258b1169f41e4a5b24d21054872e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/329336ac-bc7e-4412-849d-6a46f069c354/66854285541.pdfIn PDF document text
    • http://fariwugakek.rf.gd/simple_pencil_drawing_images_wallpaper.pdfIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_1b8fe8633d664828a6a7a4efe9af1082.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7384fb0-b358-473c-b93b-ebda3522596f/mipafawenaxatujem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb0a845-3f4e-4e8e-874c-f8573a47bbfc/rolemorubodipupa.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_b098be29877948729476375fe3fdafed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba507e3-5bd4-4895-9fb6-2a50570725f0/soil_and_water_conservation_director_va_dare_district.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_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 5224 bytes
SHA-256: ba364405d2d6a21dc5264857bd00ab32234815b131670d8de0b469aab1374f3c
font_01_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 10960 bytes
SHA-256: cc8460a095c9ae3950c9703543f5e0db6885fadbfa03349cc6b2cb488af09b09