Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10c348fa0b42278…

MALICIOUS

PDF

96.6 KB Created: 2021-06-09 21:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 73e45d49f8606be407d672e42c756458 SHA-1: 104f68ed983955b18adf4da126c7fde399d9334b SHA-256: e10c348fa0b422782a3b253b134e0aa2a607b0f1762ed229f7b0524f76e1602a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, with one prominent URL being https://chcial.ru/pbw?utm_term=1980+old+songs+tamil. The document body, though heavily obfuscated, contains references to '1980 old songs tamil' and 'wkhtmltopdf', suggesting a lure to a potentially malicious website disguised as content aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/pbw?utm_term=1980+old+songs+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fd68da7bdf85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_600cb40145b20.pdfIn PDF document text
    • https://tinalolovini.weebly.com/uploads/1/3/4/3/134371967/redaxatidojijab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fec3fc1982b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fca91591be73.pdfIn PDF document text
    • https://vimopoferozure.weebly.com/uploads/1/3/4/8/134858925/papifiguzebubew-lujufunad-vetogetolaruvet-memumup.pdfIn PDF document text
    • https://xolebezitiditas.weebly.com/uploads/1/3/7/5/137513803/fulapodikuxexufote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_60bbbd79bfcc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5fe2a05eb54bd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4457563/normal_60b2ec3b9c473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144486057/68964934171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e083622f-c0d4-4a3b-aa90-ce1e9796c208/61952109149.pdfIn PDF document text
    • http://vuxoris.pbworks.com/w/file/fetch/144844125/if_clauses_typ_1_und_2_bungen_mit_lsungen.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/31958623437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61eb5191-4d51-40fb-9589-141ca1bbfa2d/how_to_manifest_someone_369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6baaf61-db7e-4eac-b3c4-0c464396ae11/88405133852.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/euro_truck_simulator_2_apk_indir_android_oyun_club.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb513f67-c640-4d9d-a1fc-8d5cbfe25d62/2nd_degree_black_belt_krav_maga.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144427971/diary_of_a_wimpy_kid_the_last_straw_pages.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_off00013f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F09 5496 bytes
SHA-256: cd3c776edef469883d8d64cf69f8332b7d50ddbc6b0f2c33c051632e9f80c058
font_01_sfnt_off000151a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A6 10624 bytes
SHA-256: fe0aba7a5208b0b5a7296d5e348b11d8886fd967c795082886747a442397f488

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