Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f071b71b14e8a8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 08:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d28c0f78abdc8f412492e7fcada9a86 SHA-1: 35f43da2163a5466e0ff110e7ffe9ce06fbae0f3 SHA-256: 06f071b71b14e8a8db3474e7ec3c3d59647272c9533710f3043613e2fd995b06
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on disposable domains. The document body is unreadable, but the overall structure and heuristic firings suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ewdel.cz/ckfinder/userfiles/files/kademafupufisete.pdf In PDF document text
    • http://joesservicecenternj.com/userfiles/files/34879560378.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/19477543164.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lejovoxoperiluvedabixuga.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/38254141674.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210911042458.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/51884294571.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/lobowananurazafo.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/josufateboseta.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/deduv.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/diratu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191356335430.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/11001839033.pdfIn PDF document text
    • http://orlickachata.cz/files/files/46934459851.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tikulu.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/gidokuliwuwikofuwotekolo.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/97190716067.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/diwikewu.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/97730588631.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/55620130712.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/xaxami.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/ropizinuxijifozawox.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/ganivipitutijazi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7c754253016081ccfc31f9b71092b5ed/3431888922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sharkbite+codes+2021PDF 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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 17820 bytes
SHA-256: 21978028d8d91abdef33b250305a3611172f62b624428e3c36ad982bd03b72c6
font_01_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 10920 bytes
SHA-256: 51c1fb2a571cf8a45f43c06601c6ba8dc8037b61a5d73fbb6c48a6ed3f86dab4
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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