Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c5894aed5c8805…

MALICIOUS

PDF

73.3 KB Created: 2021-03-15 15:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b242f53fa9d113105d6cf6a1f71911a SHA-1: cd855f8649b56a90fedc3b47bfbfca6879d30d19 SHA-256: 81c5894aed5c8805a58c29c6253a43d8ac7fb5e8107499f648589fed0d1d7467
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous embedded URLs pointing to external sites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=improper+integral+worksheet+pdf In PDF document text
    • https://cdn.sqhk.co/damukowabij/KhhLKBy/61016758621.pdfIn PDF document text
    • https://kipopidetudi.weebly.com/uploads/1/3/1/4/131407440/zetasujimalafezo.pdfIn PDF document text
    • https://zabokibijeg.weebly.com/uploads/1/3/5/3/135350751/navagajigekawalal.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/7DPC0R7/25019637767.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/idgFGtC/broken_phone_screen_prank_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/iFhiifw/game_of_thrones_main_characters_season_8.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/f1e20d95.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/5448517.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/5037793.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/hchaMih/tech_go_launcher_ex_theme_butterfly.pdfIn PDF document text
    • http://muvavezupat.22web.org/jukozuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/juduxijumijo/PJgjif5/break_down_that_wall_ronald_reagan.pdfIn PDF document text
    • http://xubatazu.22web.org/lakexugajogijubudefemon.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/setigafat/26276700477.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/15292667017.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/kirurevumizeruxefi.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/bacteriuria_asintomatica_embarazo.pdfIn PDF document text
    • http://rukujabaxelab.epizy.com/midovaletapadewulaj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 5548 bytes
SHA-256: e24e30e88e9a7fd2c92c6cd38679378dd519fb5e2e00fc1ed5829e618f8e6753
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10176 bytes
SHA-256: 51df73bab263b1d63301b94bfaf2ca14cfa03f5748feb6d7f15db00c2000de54

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