Malicious PDF — malware analysis report

Static analysis result for SHA-256 2670470cc88b67ce…

MALICIOUS

PDF

80.2 KB Created: 2021-02-17 00:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 01a9cea1c9cafd00e7028e9afe38a67d SHA-1: 3ec98906f7bc4adb30a7d72aefcb431677fe1423 SHA-256: 2670470cc88b67ce9eb65e37e71d2cc0da863ac32e7a120a5823b1a15fe94198
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a redirect to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links, including one pointing to a link farm on disposable hosting, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=how+to+do+descriptive+writing+gcse In PDF document text
    • http://arenaprobet.com/38797212054hoga2.pdfIn PDF document text
    • http://repochka.site/konosuba_light_novel_volume_5_summaryr7hgl.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/38250127637.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/5340118.pdfIn PDF document text
    • http://dorightschool.com/calculator_apps_download_iosg9wlq.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/Yjf7jhB/vixiva.pdfIn PDF document text
    • http://kellys.space/experimental_psychology_articlesxw1wl.pdfIn PDF document text
    • http://bitukab.iblogger.org/loxev.pdfIn PDF document text
    • http://timelessdecorum.com/dragons_dogma_magick_archer_buildabjnz.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/gdgchbw/kugumebe.pdfIn PDF document text
    • http://studyweb.site/zimopiziwataboteluvinia7f2.pdfIn PDF document text
    • http://kelirifuwa.22web.org/26704971456.pdfIn PDF document text
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/5836234.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/iemjixZ/highest_average_gas_price_in_us_history.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/wilaxunipala-zofotogibe.pdfIn PDF document text
    • http://itclick.pro/how_to_download_protected_from_issuu6lngm.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
    • http://jegapedobip.epizy.com/kivetezubitolanitenebor.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_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 4900 bytes
SHA-256: 1c10e692afd1a71f076e2e921cc5f9ef5c6692b595f22a9642b80f152b70e768
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 10580 bytes
SHA-256: 6ef2ecebf23979c893cd4f74a2ca07e8c17024a9ed84d7e33b7546d436b2c41e
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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