Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9aae10184f38c4…

MALICIOUS

PDF

74.9 KB Created: 2021-06-01 11:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3e6a234434cb0938b2f1c3200dad0bd7 SHA-1: 427b95ca4034260b0f642d7334973b048b1799f4 SHA-256: 5c9aae10184f38c4956d1d402f72b1ea1027b6d42ac0241945bb4b626e1a692e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, https://inwebjor.ru/pbw?utm_term=arishfa+khan+shayari+video+sharechat, appears to be part of a SEO manipulation or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/pbw?utm_term=arishfa+khan+shayari+video+sharechat PDF link annotation
    • https://roxadiruxezagu.weebly.com/uploads/1/3/7/5/137514248/futukujanaberup.pdfIn PDF document text
    • https://wojipinokogax.weebly.com/uploads/1/3/4/8/134863097/kapizavorosuxuvova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_5fea01bf04d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_604b069e62fae.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/daturopitito-vavakiwiler-toduduluzunexo-tefomijunepitem.pdfIn PDF document text
    • https://pujatafar.weebly.com/uploads/1/3/4/8/134854232/4082496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409405/normal_5fc951fe0ab9a.pdfIn PDF document text
    • https://niduzipotobumam.weebly.com/uploads/1/3/6/0/136054567/9cb438.pdfIn PDF document text
    • https://toruruxixe.weebly.com/uploads/1/3/4/6/134698343/70601.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/lipetubodiruluga.pdfIn PDF document text
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/15454dfdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_6029cbb560e73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413370/normal_5fc8144e0c340.pdfIn PDF document text
    • https://fuliribak.weebly.com/uploads/1/3/4/6/134681530/fed703ec08.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
    • http://sijomirurefi.pbworks.com/f/62042548804.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144443043/servidores_telcel_para_http_injector_2021.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425505/rogaluzirelowekobipevemo.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/f/fesujubanirek.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413496/razonamiento_logico_matematico_santillana.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/cheatbook_2018_download_for_pc.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144444903/55706501368.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144435285/dowem.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/roommate_agreement_form_big_bang_theory.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/cuddeback_error_code_04.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/benim_hocam_yaynlar_yds-yksdil-ykdil_video_ders_notlar.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144416433/famous_quotes_on_friendship_in_marathi.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/zizevekofug.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144423891/report_lost_card_hsbc.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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 5080 bytes
SHA-256: 1628030926595352dca30f335aafb75aed9eeb92d08bd06ffbfa9ce8eff09bf9
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 10080 bytes
SHA-256: f6927547055d55d8d11f6749a518bf01e6bdf88ba07994e0cf07929dd91b9527
font_02_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f