Malicious PDF — malware analysis report

Static analysis result for SHA-256 903a2feda259b140…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 12:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b6ef92f28fff4de8f412a8dfff97f01 SHA-1: cc755a8a8a8aeef54f3200649f953855f29eeecd SHA-256: 903a2feda259b140e51648ba9dfbb211b0cecee7bd98de5ac91d86722f734bcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest a phishing or malware distribution campaign. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://angkaganjil.com/contents/files/zonoluxixa.pdf In PDF document text
    • http://mrpennarak.com/user_file/file/17773992295.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/35432523477.pdfIn PDF document text
    • http://goldmustang.com/files/files/jisegef.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/64896358198.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/2587513856.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/95199162600.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/92115155470.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/xazibo.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/didikobatogegupe.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jejavimeg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161302c982d6ab---90494096565.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/tofatobu.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/18686058876.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/87681500626.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/fulakusurom.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/49028806622.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/livivebikizilos.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/76685706347.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/43613639885.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/tewobekifikikaj.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/mupuvugolitupadavafupasum.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/54032301707.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/76983995143.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/44783725326.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nekuxawasosul.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/93904075239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=liters+to+milliliters+worksheetsPDF 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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 10244 bytes
SHA-256: 6be2db9444dc2863f2ac3d4d8bf4941dee45ac878ec871268b297917bb259707
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 18364 bytes
SHA-256: 6c4a791a6508829e8ea0e953aee7445f54cd4c48b8c7799046006da7f76d9d5a
font_02_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1