Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a96a2fc34e14881…

MALICIOUS

PDF

104.1 KB Created: 2021-02-11 06:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da19cd358ff128ca7a91ce369b300402 SHA-1: dc2713bc91b5b708c0d57871a8add6241915f6a8 SHA-256: 4a96a2fc34e1488152fa82728aebc3089200bd306639620aa4351e47108f4a4b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to 'marine biology journal guide for authors' to direct users to external sites. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://baarspo.ru/aws?utm_term=marine+biology+journal+guide+for+authors PDF link annotation
    • http://leopards.space/chainsmokers_songs_zip_filearmj9.pdfIn PDF document text
    • http://wifefavowe.iblogger.org/xenimaxiruvi.pdfIn PDF document text
    • http://llloooodddd.space/gloomhaven_tabletop_simulatorea1gw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_60180ba32c5a8.pdfIn PDF document text
    • http://pasendapp.online/wifi_hacking_software_for_android_apk8toso.pdfIn PDF document text
    • http://taher-tcac.com/ninja_foodi_grill_walmart_canada4dbox.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/vexugebegabebebavagutosrwn03.pdfIn PDF document text
    • http://lbaranaydin.com/63170007970gy4fb.pdfIn PDF document text
    • http://uaportal.site/guided_reading_comprehension_activities_year_306grc.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://delisomujiroma.epizy.com/powerpoint_org_chart_template_free.pdfIn PDF document text
    • http://kosinatatit.rf.gd/89292792012.pdfIn PDF document text
    • http://joposib.rf.gd/powanukima.pdfIn PDF document text
    • http://zapizuw.rf.gd/burlesque_performance_chinese.pdfIn PDF document text
    • http://bixuxopot.epizy.com/bewars_telugu_full_movie_free.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/football_sports_information_in_marathi.pdfIn PDF document text
    • http://lelupiborojez.epizy.com/follicular_carcinoma_thyroid_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/70439285011.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 5376 bytes
SHA-256: 9e4ba1a41b5621adfb6efa3a15af3b4b6779f56d129e94491347f9a8e9f69952
font_01_sfnt_off00013840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 18048 bytes
SHA-256: 70aebce07db94ccb3811b32f1c207a1ebc7e45975e3c9219fd07f105fc36cfa8
font_02_sfnt_off00016ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF0 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off0001841e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1841E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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