Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faec57af0d85b37…

MALICIOUS

PDF

145.3 KB Created: 2021-03-25 08:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 953f08796bcb23483fea8e75a83b5b48 SHA-1: c2301c176e5d7903b617ac813ca7db0ac2e62392 SHA-256: 9faec57af0d85b37c5728db32e016a13a1f340fbdbd489ea25789f54147acefc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gimoguvi.ru/award?keyword=introduction+to+phylum+arthropoda+pdf PDF link annotation
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/49f091e03830.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/ieicgiK/sms_auto_forwarding_android.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/gokamuzazu.pdfIn PDF document text
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/xariligobarogovi.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/CzHIohj/72821066736.pdfIn PDF document text
    • http://madamewezakab.iblogger.org/cbse_sample_paper_2020_class_12_biology.pdfIn PDF document text
    • https://cdn.sqhk.co/sazipuvaxiv/iDWvgdw/pipagisux.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/pbfgfia/angry_crab_shack_reviews_happy_valley.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5fe011108aa6b.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/4jhYDgi/one_clue_crossword_answers_word_of_the_day.pdfIn PDF document text
    • https://kabaposirivapej.weebly.com/uploads/1/3/2/6/132680813/rujokorepawetave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_600fee050e789.pdfIn PDF document text
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/nunumi_tiluxazasi.pdfIn PDF document text
    • http://pujesuwidiw.22web.org/kufevelerurel.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/iDidNie/knock_down_texture_spray.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://uploads.strikinglycdn.com/files/e422cf6f-d9b9-43c7-9133-d47dbcc0327f/4014773521.pdfIn PDF document text
    • http://pixezoki.rf.gd/65112500191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd45561e-3e8d-4f82-accf-f943ee21cf90/tizijamam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd3cccd-64ac-4c38-b351-d667dfdca36b/bojivemewipis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ad1938-4c0a-4427-97a0-e10c26dee41f/78375599880.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCF6 5020 bytes
SHA-256: 2a67f8f421e8b085bac4b608796d10e8581b134e6a0c7149a2c4b286c8a00ffd
font_01_sfnt_off0001edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDD3 1716 bytes
SHA-256: 7775e8e7c4329a1c5bd112c001158d8940360085fc48f9208aadc231de0e3d90
font_02_sfnt_off0001f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F67A 15352 bytes
SHA-256: 4a3ef7672fc0076150d4ecd2f0e01a1c939defd74a243263e9819cd4a9a777ae
font_03_sfnt_off00022711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22711 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3