Malicious PDF — malware analysis report

Static analysis result for SHA-256 8523a3e7c6592bbf…

MALICIOUS

PDF

79.9 KB Created: 2021-02-15 10:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04df3b3b2d342c2b73fb93917dd8bf56 SHA-1: 9b9fac198bfb2f00f045f2268159fece2e9cdcfe SHA-256: 8523a3e7c6592bbf683c5ac96a65b0e8629e41240677955932ae85cf979988e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with several pointing to suspicious domains and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wb?keyword=classifying%20rational%20numbers%20worksheet PDF link annotation
    • https://cdn.sqhk.co/jorevagu/AjgJgje/operation_new_earth_pc_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/BSgf7bg/paw_runner_puppy_pads.pdfIn PDF document text
    • http://voyazh-shina.com/76604937028apcar.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/iichagh/jogolalemomewo.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/hfjaghg/62744846470.pdfIn PDF document text
    • http://eu-study.ru/92891599658w1byp.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/hjjaghC/vokazimujuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fe8ba255dc39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5fdd07a1c46f3.pdfIn PDF document text
    • http://robinmani.site/photoshop_baptism_templates_freer492q.pdfIn PDF document text
    • http://autocredit.moscow/surah_al_kahf_in_englishrp6gb.pdfIn PDF document text
    • http://copyrighthelpptteam.com/lexirrwysp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fedab2f26690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_6010acdf31eb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sevoga/1231800687.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/bleachbit_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/ch_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/45219366216.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/63389664760.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/dometuwibosukip.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/wrong_turn_1_movie_in_tamilrockers.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
    • 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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 5484 bytes
SHA-256: 75fa2e2543d0b961119cb2c2c32c705c21688baa3f8cb46d9a276132737882ee
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 11432 bytes
SHA-256: e3b8a8d1defd8265f2117e3f26e077faa9138e35aee6d8657ef8ffc7303f7108
font_02_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 16140 bytes
SHA-256: 1b02b7f50665f9cedd1bd4c3140cc65e1ed8fa71feac5c0f046386ded4b17cc6

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