Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2492b61f5a163d6…

MALICIOUS

PDF

97.7 KB Created: 2021-02-13 21:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eac60aa4fba55a9ce97f2117e83c7d6a SHA-1: c647fbdfd16f7a4b7484060c976e1a4df3017e2a SHA-256: a2492b61f5a163d626da3812d600b6168be441fbade56db4e03eb51a70d16080
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a sniper rifle bullet, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=l115a3+sniper+rifle+bullet In PDF document text
    • https://saxurugilura.weebly.com/uploads/1/3/2/8/132814125/wegudepan_faxewo_jukebinaz.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/mibiku.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/f170230a65d1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jdhiLia/bewonomudimo.pdfIn PDF document text
    • http://pepojen.iblogger.org/bosasit.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/4278293959.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/wghfjbo/animal_colouring_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gJsUijW/dead_colony_bees.pdfIn PDF document text
    • http://fozobojik.iblogger.org/1080p_video_player_for_android_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/9igdgiH/peveku.pdfIn PDF document text
    • https://kepubewi.weebly.com/uploads/1/3/6/0/136095452/43f5b765.pdfIn PDF document text
    • http://xikimifo.66ghz.com/xikematulonadixevizevepo.pdfIn PDF document text
    • http://vadonodip.22web.org/the_cabbage_soup_diet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisenunab.rf.gd/new_bedford_ma_police_reports.pdfIn PDF document text
    • http://limixumijegaf.epizy.com/significado_de_caliciforme.pdfIn PDF document text
    • http://mivevusewez.epizy.com/62517567583.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/celotex_floor_insulation_data_sheet.pdfIn PDF document text
    • http://lavavoju.rf.gd/gateway_b2_tests_answers_unit_1.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_off000131c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C6 3572 bytes
SHA-256: 2c7ecc7d1045991d83c05901dbfdc06e496f3af962495ca5a1e1f7f80be821f8
font_01_sfnt_off00013e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 5316 bytes
SHA-256: e9b526da6ce397e4a369ebf7f38e0d03b150a5f1099030598b97d326f31311d1
font_02_sfnt_off000150b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B7 12176 bytes
SHA-256: b8effd9c34fa428b858929cc1557d368f44ea42bb112a237de02f8451b319ea7

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