Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1b3d31c5da0fca…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 12:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c471e089a6a08dcb26d8c43e492c076 SHA-1: 35c9689afb538c234c75d7e466157a19ef1bacb8 SHA-256: cc1b3d31c5da0fca06943203ec01d36e16787338af985ce82e9856972db31a52
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for SEO manipulation or to distribute further malware. The embedded URLs point to various PDF files hosted on different domains, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aarushimukhwas.idealviews.com/userfiles/files/zidanavawot.pdf In PDF document text
    • http://dyglas.com/userData/board/file/gawagidusijejivuxo.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/75531875568.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/28970288024.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/58561155925.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45e3bc47a---jurugijupopikiko.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/86089746159.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/67861911315.pdfIn PDF document text
    • http://ladna.pl/user_images/file/2660221543.pdfIn PDF document text
    • http://indexone.ru/upload/file/83649596110.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/45124203480.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/59064954799.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/bovolubebafe.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/81685907003.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/labafejodasasodomon.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/12320146728.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/fumimurageg.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/mejibalidam.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jipipugoxarumovevavazo.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/bozejoror.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61034052662.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kixebomomaz.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/76932551111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=candy+crush+mod+apk+unlimited+everythingPDF 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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 17124 bytes
SHA-256: 19ac03bd434a545ab5acea42c3d085f40d50989dbc79f0a3bc50477bc598efa8
font_02_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 11364 bytes
SHA-256: 5957dc2cb164cd1266733cfa968c26c1413db77f698973cda3eb29d13f85128f

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