Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65b76ad6b63a869…

MALICIOUS

PDF

81.9 KB Created: 2021-04-07 02:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b5db0d163a4ec09ebc7567962cdb36d6 SHA-1: c6fc106adb2d2a611c2d7f3d68de75429d458daa SHA-256: b65b76ad6b63a869563bfa7536bba9c578163c7dcf5d6c658e311fe6d05f86bf
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and the overall structure point towards a spearphishing attachment used to redirect victims to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=starbucks+barista+salary+vancouver PDF link annotation
    • http://normaa-id.com/3397709075541yj2.pdfIn PDF document text
    • http://it50disconto.info/face_to_face_interview_definition8vmu3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_601d0678bc762.pdfIn PDF document text
    • http://testvvd.xyz/how_do_you_write_a_good_self_evaluation8qxjd.pdfIn PDF document text
    • http://uaregroup.com/bank_teller_job_resumecdri5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fd94ca340df7.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/belajar_bahasa_mandarin_sehari_hari.pdfIn PDF document text
    • http://canonsburglake.org/mokubesezurumige4ybu4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fec2203197a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5ffd682327367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewimovonuwakag.rf.gd/suxirisorizozuferu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5aa8b9-93a7-4c9b-9dd0-0b0cc29199b6/sirebisetopulemexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2505e275-1999-45c3-b268-d044eadc54f7/mapizaxasosagobad.pdfIn PDF document text
    • http://xuvafinuvewabek.epizy.com/17572554431.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/ragnarok_m_acolyte_solo_leveling_guide.pdfIn PDF document text
    • http://kosisat.epizy.com/75524612778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcebb32c-3e84-49b7-8dcc-9883c69e82b4/craftsman_18_inch_electric_chainsaw_chain.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/cloudformation_template_example_vpc.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/easy_homemade_pizza_dough_with_self_rising_flour.pdfIn PDF document text
    • http://borobosen.rf.gd/74391163516.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/pifadatur.pdfIn PDF document text
    • http://walaratetev.epizy.com/72588821006.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/fazomoletaruw.pdfIn PDF document text
    • http://dogekozi.epizy.com/jilus.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_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 5260 bytes
SHA-256: 90746a81d660596847a1ff12cb051f2c4662b9d551be9d0ab7aeeb83c5be149c
font_01_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 11536 bytes
SHA-256: df1f4c2265291d4540266d25a137c9f2b043d7cae9e4e59e8cbad762299352c4

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