Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde908604ff19f3a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 11:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73d6937fe442d39702282a2285db0907 SHA-1: 520cbdfcdefdde386cd4c2ae44535f15606c4a66 SHA-256: cde908604ff19f3a9332fd6520e2c141162f62317e923453a4fb87955b113b24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this assessment.

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://topflexsports.com/uploads/jemavajugowarowafupotoz.pdf In PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/64751752283.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130bdb541dfc---kabuvatagegu.pdfIn PDF document text
    • http://splogservice.ru/content/files/58991013516.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/newerowasir.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/32657303990.pdfIn PDF document text
    • https://onlinendttraining.net/files/56037671822.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/12556410160.pdfIn PDF document text
    • http://melabo.com/upload/files/senajifiriwujopudimapib.pdfIn PDF document text
    • http://belv.ru/userfiles/file/sojojoxiwipawexefolenoju.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/welekotufabobowubu.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vusumodewejugivi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302a11ca9a5---ziralewaribu.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/25394118956.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/59053384469.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/10273742251.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/67349280974.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/2663739981.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/loxizebijaxoje.pdfIn PDF document text
    • https://signika.pl/Upload/file/80144972534.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912174645.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/89403860623.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/tejofefijigarexotagexom.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/nitaxanirom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=adb+start+app+from+command+linePDF 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_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 10904 bytes
SHA-256: 1eefb479828722be4b0919a41cc98b7c23e0c2cd9ba533fe39ba71c2e71eb1ca
font_01_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 17460 bytes
SHA-256: ba6e52123c70cd5c691ea272bc96a7cec82e2f9e05fbca13ff4c23315eb6843c