Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bc517bbf207eed…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 08:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1a7d5f35a3cd60c1b4745bdc8e72f858 SHA-1: 6eb8544f61fb7b43788fb9d75cb71381c9f44334 SHA-256: f1bc517bbf207eedc6507973827ea67209843e32918f131d49eb604644da3be6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/wix?keyword=simulated+beadlock+wheels+jeep+jk PDF link annotation
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/1044789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6051ca9a391fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_602195d5c2fa6.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/640691.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/dbe1977.pdfIn PDF document text
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/kozaxosexalisizuzis.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/73648e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_603f6aefe6c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_600eda971cf8e.pdfIn PDF document text
    • http://zizuvajutenuvun.22web.org/pevomebogewepupoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/times_of_india_chennai_epaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c2c633-caa7-4ff5-b0e7-77b5f5514eba/fepolusitesuweguxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4983e951-350a-42ba-9808-906f7753e8d5/gufidekipiporevetiligalu.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/dosejigebapudesavuvagiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5418fba-1f81-48ba-92b6-d9234afbe01b/42855253657.pdfIn PDF document text
    • http://tavudedenudisuj.epizy.com/sherlock_holmes_part_2_full_movie_in_hindi_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ce9b5a-a1e0-441e-8c3d-31caf363b717/what_is_a_conflict_resolution_technique.pdfIn PDF document text
    • http://vugofixev.rf.gd/67659306842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1763d5-dee2-4779-a7e7-bcc976fc66b7/vegigoxipisi.pdfIn PDF document text
    • http://sevidimifab.epizy.com/gw2_incinerator_collection_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c981ee-8004-46ea-a9b7-dbfc6258b550/feliz_navidad_translation_portuguese.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/answers_lyrics_isaac_gracie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd87edb3-31be-4ec7-a617-6539d363579e/vubuzeva.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/tonegewafotove.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 5468 bytes
SHA-256: 8ae0dff0730660cdea38c50bc7c894c5dcb53fd6a4846c910eee041109a3a872
font_01_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 11024 bytes
SHA-256: 8e098feef7a92445b788a5bcfbc2eb395e9f26295845c4dccc6cbc002f6cd9e2
font_02_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2