Malicious PDF — malware analysis report

Static analysis result for SHA-256 958f32e3508433e9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 01:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8487047a83481425ea7c060fe9d11922 SHA-1: 17ee7b4e35bb745a6b78d74a685a189b412bca3c SHA-256: 958f32e3508433e900f0fa388a9239e6675647c538769abc6a96e168057adfb9
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable or used for hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, suggesting the PDF is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff66834561---mowakenepebipapibe.pdf In PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/kutotamenemarijagejoguj.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/6712898836.pdfIn PDF document text
    • http://artio.pl/files/files/19380741.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63727017079.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/22313765238.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/bozozojakesutiwefex.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210907_0BD7FE42B747391E.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/dosunuju.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/mufogimuva.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/botewerepatuveni.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/15105141681.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/88679881287.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/98852202275.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/36849523242.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/32774771608.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/14849280724.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/92669669354.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210901_09BDBF9C1FA2E14E.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/46636443415.pdfIn PDF document text
    • http://arsvet.ru/img/upload/vuwababudagadulamameku.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/52208375879.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/35898863769.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/46063571357.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/15935558127.pdfIn PDF document text
    • https://digireg.nu/upload/gunimavokabizusuzot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kimetsu+no+yaiba+movie+mugen+train+full+movie+freePDF 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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 19184 bytes
SHA-256: 72633cb9c05eb222a3df21c7d7d628d5db52b8ee083024e6598bf7593d3a4426
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 10968 bytes
SHA-256: 78ce92f6491bf10e587da586101f3665fe53d56131a78fc9134071a5680e7944