Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5868545a5e6ec8…

MALICIOUS

PDF

73.0 KB Created: 2021-02-02 23:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c0a886325089c4c3eb76cbd3d715b372 SHA-1: e7541c621a7659eb4e4be5dc65cc5786103433ff SHA-256: 7f5868545a5e6ec8a3486f56b2bd3e51273d8d682ef9d64f71394cd038c2aec8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though partially corrupted, suggests a lure related to 'Avogadro's law formula calculator', which redirects to a suspicious URL. The presence of numerous external URIs and link farm indicators further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=avogadro%2527s+law+formula+calculator PDF link annotation
    • http://kowesaxulenim.22web.org/bairi_kangana_2_hd_movie.pdfIn PDF document text
    • http://weinmvc.net/laura_clery_idiot_bookguuex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600b9f608c89a.pdfIn PDF document text
    • http://workmonster.net/zobuxesusav0r6wz.pdfIn PDF document text
    • http://trokot-tonirovka.online/34752055282m1wu2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6584fe3cef.pdfIn PDF document text
    • http://steel-lipetsk.ru/rolunubo06ebt.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/JsibicE/game_of_thrones_chinese_bamboo_flute_ringtone_download.pdfIn PDF document text
    • http://vpntop.info/physical_description_in_englishcrq45.pdfIn PDF document text
    • http://sfhgfje5df.xyz/sinigetafibutotv589.pdfIn PDF document text
    • http://fresh-ita.fun/gangster_wallpaper_girlfz6yr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roniwixanedif.epizy.com/56938355564.pdfIn PDF document text
    • http://molodetagako.epizy.com/93965877911.pdfIn PDF document text
    • http://xuboxigaxa.rf.gd/brightburn_2019_full_movie_480p.pdfIn PDF document text
    • http://pasalalu.rf.gd/album_cut_songs_free_in_tamil.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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 5516 bytes
SHA-256: e33759c08dd836db14618a8be756219088ede5197601fa05dd76a3941aecf94e
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 11592 bytes
SHA-256: b6a0afaf904982a5a1cd35d0d8a1b7f067edf0588c02883b3218da906146ba97

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