Malicious PDF — malware analysis report

Static analysis result for SHA-256 b628784336012932…

MALICIOUS

PDF

78.6 KB Created: 2021-04-14 23:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b13ecc9fcdbf70631ef29fc58ea4034e SHA-1: e178ac99a3ca57e60a7c005fb9d0487d895fab19 SHA-256: b628784336012932a35ebc642728f7c7a87db07e288030e01b0f790c6e2dfc92
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external URIs pointing to various PDF files, likely as a tactic to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, with the document likely serving as a lure to phishing or malware download sites. No scripts were extracted from this sample, but the extensive use of external links suggests a primary function of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+repair+car+pump PDF link annotation
    • http://wide-take.top/ethical_issues_in_business_a_philosophical_approach_8th_edition_ebook9yuyz.pdfIn PDF document text
    • http://pusokum.66ghz.com/information_on_the_rock_band_queen.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/xipujorixupara.pdfIn PDF document text
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/wazuwepufukizupebaz.pdfIn PDF document text
    • http://bachanalytics.com/mind_map_examples9boj0.pdfIn PDF document text
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/f493ade.pdfIn PDF document text
    • https://wapafakomix.weebly.com/uploads/1/3/4/7/134740591/bafidugi_lubumok_gezetozironum_rogapotowiwit.pdfIn PDF document text
    • http://marketitaly.pro/kugivuwugibepulordave.pdfIn PDF document text
    • https://nazafusi.weebly.com/uploads/1/3/5/2/135297870/kivejisilu.pdfIn PDF document text
    • https://sivasanetit.weebly.com/uploads/1/3/6/0/136095735/xikizomig.pdfIn PDF document text
    • http://pshcomonhere.xyz/john_deere_567_baler_reviewsczr6d.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/e6fad521.pdfIn PDF document text
    • https://vuvumapidikam.weebly.com/uploads/1/3/4/6/134668868/5335057.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/mezudoferoniteni.pdfIn PDF document text
    • http://d2-club.ru/how_do_you_turn_on_a_microsoft_wireless_keyboard_200037omm.pdfIn PDF document text
    • http://sawezudo.iblogger.org/rinnai_ruc98in_ultra_series_concentric_twin_pipe_installation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_a9bd4d6fc24a4cd9a1da456c78f3b249.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_974c8ea32df24f0792b379fd1fb0bd83.pdf?index=trueIn PDF document text
    • http://zogaxemajov.epizy.com/720340157.pdfIn PDF document text
    • http://budanizuwuder.epizy.com/sukomaxidowepexemilupameg.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_45e3fb17ddc74b37a47e258c2a586c4c.pdf?index=trueIn PDF document text
    • https://2c5ec8d5-f9c1-4d2e-b5af-57fc4572578a.filesusr.com/ugd/7e0eb0_efef951ed11b46c5b279d8890f259b5e.pdf?index=trueIn PDF document text
    • http://lowazuxakosilal.epizy.com/rozekubiritibuwejazu.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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 4924 bytes
SHA-256: 59ac4b16c99213bee7aee469f08e8cb7f62fef2790edb620739353f9047741cb
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 11144 bytes
SHA-256: 3e51868f4c3fc44fc440f3a4d1c471ec04ab8b282a786c5a707b3c9c173c9485