Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53dde0026fccca8…

MALICIOUS

PDF

78.2 KB Created: 2021-03-07 11:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 023436cdacd12d90b4efd37e27700c31 SHA-1: 648264f7d93458459f5dcad9843e25649c173a55 SHA-256: e53dde0026fccca85209af086cc952af47c61daa3cf912d501dacbceb3026967
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous embedded URLs, with one specifically targeting a "gopro 4 manual" keyword, suggesting a lure for phishing or malware distribution. The presence of external URIs and the PDF structure indicate an attempt to redirect users to potentially harmful content hosted on various domains.

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://golowaki.ru/wix?keyword=gopro+4+manual PDF link annotation
    • http://igcopyrightverify.com/lucent_synonyms_and_antonyms_book_downloado8vy3.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/jdggyY5/43940481843.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/M7ghjbS/robot_boy_cartoon_network_intro.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/LZG1hia/41378142646.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/edGpk2O/47739988478.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/gdticfg/target_shooting_in_king_county.pdfIn PDF document text
    • http://coolmag.biz/4854603528251xy4.pdfIn PDF document text
    • http://zukuwoluzut.iblogger.org/53206427090.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/blouse_neck_designs_2018_latest_imagess22ck.pdfIn PDF document text
    • http://prodson.space/how_to_read_wind_rosep6ta6.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/h4hggjH/kovunisilipulabefuk.pdfIn PDF document text
    • http://portkamesto.site/329216279893d57t.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/je5gfCk/fortnite_battle_royale_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jaghahi/90210949753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://volitig.rf.gd/28256684196.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/50998333143.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_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 4908 bytes
SHA-256: fa8acaa19edfd53fe529759f3ae94225386538674a9544f8d338177d42069583
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 10560 bytes
SHA-256: dd66efd605ee464d4e409dc9d535eb0aaf8f3b4eac078956e61f896219fe6d50

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