Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb3422cf3c84b1e…

MALICIOUS

PDF

87.1 KB Created: 2021-03-01 23:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6bc66d7c6596e6aaeb6b2fd363730f5a SHA-1: b95de2295107f9e144a9874a835f2b91d34a3915 SHA-256: cbb3422cf3c84b1e7f966d655901a1a68a0be16b50389e0dcc670e8d8c59f6cf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests it is a lure, likely to trick users into visiting malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://yafferge.ru/award?keyword=contemporary+nursing+issues+trends+%2526+management+pdf+free In PDF document text
    • http://supfitket.buzz/kajotuwaget6oxcs.pdfIn PDF document text
    • http://it50disconto.info/love_dare_book_examplesfneh2.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/Wjbtbev/zobapipejajita.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/dIrjhhc/the_stock_market_game_youtube.pdfIn PDF document text
    • http://ebay-coupon.ru/saxophone_repair_cost84ij2.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/90108921151.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/toro_weed_trimmer_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/etBbJhg/72097976404.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/forrester_reports_free7kbr8.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/hjiB4gh/44461864967.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/7iggcib/x_runner_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/igcoXij/weekend_update_saturday_night_live_youtube.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/kowedixabomapidug.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/vagizazakolexezepazererhvsn4.pdfIn PDF document text
    • https://cdn.sqhk.co/foturozav/hhdFhhJ/95598598690.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/0tjazgc/53484840295.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/korabitejodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/befarekogol/vtech_phone_answering_machine_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/26782146486.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/gisusasevi.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/washington_gas_rate_increase_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/44971086517.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 5252 bytes
SHA-256: f22d8e967a6549d94f43e19cb7aada186b30272adb78bd4fed8b8706e3779fd4
font_01_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 10988 bytes
SHA-256: d5c3db03ad24fe3afd1282f036dc2aa7417630b6e89f5d895206729dd1b1f4f9
font_02_sfnt_off000140b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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