Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca76b1d6666a64c5…

MALICIOUS

PDF

111.5 KB Created: 2021-02-22 01:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a8834df49f0f292eb53645d3320b0e2c SHA-1: fdab442388a5c2b286d3e8955bf4e85a16e6e530 SHA-256: ca76b1d6666a64c58321186aad0d7fde91082bfb0096d3d2c2c0b422d66c9c48
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, many hosted on disposable or free platforms, and one specifically to a malicious redirector. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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 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://yafferge.ru/strik?utm_term=art+yasmina+reza+pdf+fran%25C3%25A7ais In PDF document text
    • http://zuwazari.22web.org/fubaxan.pdfIn PDF document text
    • https://wopuxikejixup.weebly.com/uploads/1/3/1/8/131856699/7769689.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/geliwomokekesini.pdfIn PDF document text
    • http://tcerkovniekupola.space/26727133525nz8fz.pdfIn PDF document text
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/03513abde4fc6b3.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/ugeWgj5/foosball_air_hockey_pool_ping_pong_table.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/jhfLija/xaxipadagivijatefopigamu.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/hpegfVC/celestial_definition_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/ibcigwG/76667430755.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/9dc8a.pdfIn PDF document text
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/6138561.pdfIn PDF document text
    • http://hq-cleartv.info/31670098419v9qs7.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/fisidemifivotibibu.pdfIn PDF document text
    • http://wutugupim.iblogger.org/plural_form_of_state_attorney_general.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/zXTicjj/cardi_b_songs_2020_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/QCijJVo/wedding_cake_prices_and_pictures_philippines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevonaku.rf.gd/nesterj_nes_emulator_psp.pdfIn PDF document text
    • http://lunupesefobe.rf.gd/53199052131.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_off00017529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17529 5480 bytes
SHA-256: e484b4ec2d108dbc697b6cc9e106466c738a47df9c1f175339644162a5d34578
font_01_sfnt_off000187cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187CD 12088 bytes
SHA-256: c682f2590b79dc76a6fa2c7116bab9f087a81c4eb58d320da8ffa944b0a3fa57

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