Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a1c47cd6534485…

MALICIOUS

PDF

95.5 KB Created: 2021-04-20 10:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d61c911ac3865e97bf4c4e7d92e6192 SHA-1: 212a9d10d5ad438df487bed9231faa7c92271216 SHA-256: b6a1c47cd653448573754456569293553f4d932bd9b21e35305709b65df2e216
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'The legal wife episode summary' and is associated with numerous URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://jottigo.ru/strik?utm_term=the+legal+wife+episode+summary', suggests a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and associated heuristics point towards a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=the+legal+wife+episode+summary PDF link annotation
    • https://cdn.sqhk.co/rigowodikot/vMiajgt/65906303005.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/hhhdD0v/tokexexexalomabopubug.pdfIn PDF document text
    • http://bemowasogikoj.22web.org/chidiya_wala_game_ing.pdfIn PDF document text
    • http://swiss-gear.store/54272219831omt2r.pdfIn PDF document text
    • https://cdn.sqhk.co/sudofeno/ghdcwjh/the_big_farm_theory_apk.pdfIn PDF document text
    • http://infokurs.design/9128504942461d78.pdfIn PDF document text
    • https://cdn.sqhk.co/kubemuzu/Zgd7Lji/jaspersoft_ireport_designer_5._5._0_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5fcdb71790fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_604d4be1328ab.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/desasizinal5zop.pdfIn PDF document text
    • http://taher-tcac.com/homescapes_cheats_level_1938o92bu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476443/normal_5fcb716e7ecc1.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/66Vjgja/gugozamokelutof.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/56367005089.pdfIn PDF document text
    • http://mijikabetabup.rf.gd/reset_drum_counter_brother_hl_3170cdw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdcec16-b4c6-454b-8d9d-8e9690cbf147/15307259437.pdfIn PDF document text
    • http://newumil.epizy.com/73931580834.pdfIn PDF document text
    • http://zugopenuk.epizy.com/bizanimuwemuziluzabewerej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543e91a8-66e4-499d-aada-e755d138c760/23668524453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f19aed-782e-4114-81d4-b947647dad8f/is_my_breville_juicer_dishwasher_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/48954540264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cddeeb-d9de-47c0-852c-34dad69ab262/nazamatadifizugofiwaga.pdfIn PDF document text
    • http://bewexopol.rf.gd/gakududedusobufovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fcc036-3d57-4716-9d6b-0172005c725f/80317589220.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/mevonofosukabozu.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012c8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C8C 9964 bytes
SHA-256: c30c2b17eeb3b5fac17cd2c2c0e45c28e9948837587741792685ea70d7606617
font_00_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 5600 bytes
SHA-256: 0356b8f8e46316253407f48833a6ddf9d569648f3bd05de875a456f7a8cf6d66
font_02_sfnt_off00014867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14867 11924 bytes
SHA-256: 08b220041cf851b7486a27f7576f71d154435138ac10ec310bf41ce54b62e79f