Malicious PDF — malware analysis report

Static analysis result for SHA-256 763674c57ae61f2a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 11:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 731f568e994a0badc144442ccc57ab62 SHA-1: 4a9383f6214f9983130752a93cb529dd46b494fc SHA-256: 763674c57ae61f2aa20b9eb22b94b6c15c0c1e7ec88ccee640599b8afd6c7fb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point towards a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://stillincontact.com/images/mails/file/sesodiviwe.pdf In PDF document text
    • http://noahmission.org/dataroom/file/90801758198.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/48398741860.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/20092090306.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/sifogamozubogox.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/kulimekolibowopujumako.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/jiwijajetesufutovi.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/jigitujodadupedetonuwulir.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210905091411.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dedetujifixoxepob.pdfIn PDF document text
    • http://machin.kr/userData/board/file/nobemigip.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/77859916887.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/parobarafijajuba.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/posigokoni.pdfIn PDF document text
    • https://taperagi.com/contents/files/44307511121.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/tejifawabaririwavuluma.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/62305395536.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/xuzigarijejomijononoxu.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wiwixetovofebozukab.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/88354881158.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613592470d7d3---24086726355.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/55832450585.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/18623440560.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/zevazajeweginedoluxixapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=localizar+gps+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 18684 bytes
SHA-256: b91a7fa999e11232cec21717280d32cf3ae1fe230bf845e92201f2b3f257533a
font_02_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 10476 bytes
SHA-256: 0f438cc76349cfaa5d672ea5360bf96d6b353636a9c962504a717cf94cdc0bc6

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