Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5feba232821332a…

MALICIOUS

PDF

77.8 KB Created: 2021-06-02 07:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6b1ae42028a06a3b8e2ec24689ac8b7c SHA-1: 576b4c772445b0ba4f34c29b82e2b9e76cf5174c SHA-256: e5feba232821332a54b1e6010a99f9697021fa047d9df5e6b12e50356c7d8c4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be related to driver downloads, a common lure for malware. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://queure.ru/pbw?utm_term=mvci+driver+for+toyota+tis+windows+10+64+bit PDF link annotation
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/fosokafunexopapafavi.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/fipezowaru_sarulaz_repiwig.pdfIn PDF document text
    • https://dipojujepu.weebly.com/uploads/1/3/4/5/134526160/kepopowaz.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/jesazipatoxak_jijudibozu_rinenosarika.pdfIn PDF document text
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/2212854.pdfIn PDF document text
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/fefatipopuroneridit.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/ruzixejelufa_gemotetatimuduj_jojuma_kurexab.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/8230382.pdfIn PDF document text
    • https://tedunifadikave.weebly.com/uploads/1/3/7/5/137505165/bf90d8ed9f.pdfIn PDF document text
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/zewugokolomipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palixazoke.pbworks.com/f/mba_cet_2015_question_papers_with_answers.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/oracion_del_credo_catolico.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144480636/25086870306.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144483846/65782575408.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/8052408104.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/69204089220.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144469017/46472644728.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144460464/what_is_form_design_in_hindi.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/62528081999.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/1448114741.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/mutevezelenike.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/f/primo_water_cooler_cleaning.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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5820 bytes
SHA-256: 6397126f46b2728afaea5f948d13dfa73025a44ded2938cec27998f56edc4bee
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 11444 bytes
SHA-256: 649f17ba711764acfb199b48d1eaff3d2ff3f24cf10e050e3bd7ce097e012c45