Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfc1193a9bf5f7a…

MALICIOUS

PDF

132.5 KB Created: 2021-03-30 06:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f4ddc8acfcce04f50c77049c3b97bfae SHA-1: f78bcdd6e465ec4fc8777811d9e1883beb3e03f1 SHA-256: dbfc1193a9bf5f7aa99fff8d2d734c47a2c31ac8d4aacdc998506ccc4dabacc1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm hosted on disposable domains. One prominent URL, 'https://maypoin.ru/strik?utm_term=bartolome+de+las+casas+means', is flagged as a potential phishing or malware distribution point. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent.

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://maypoin.ru/strik?utm_term=bartolome+de+las+casas+means PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473384/normal_601279eb67859.pdfIn PDF document text
    • http://comforfemj.fun/47887039850a9ymw.pdfIn PDF document text
    • http://jirazabewofi.22web.org/97711109451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_604f1e8bea26b.pdfIn PDF document text
    • http://chisto-chisto52.ru/rudetilakozajv1pf4.pdfIn PDF document text
    • http://tdsevsvet.ru/does_subway_nutrition_include_breadb5fvt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_601135660e395.pdfIn PDF document text
    • http://gatorama.site/petazepoxeporizichkuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5fed53809d013.pdfIn PDF document text
    • http://mixit.info/penosibunibeluzur3x7j3.pdfIn PDF document text
    • http://mstmail.space/zadumawalozujorotogaperukw2lt.pdfIn PDF document text
    • http://4kuhd.me/539265539333gfff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_60215d1a50b70.pdfIn PDF document text
    • http://girawazumutaw.22web.org/demazujogururasilade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/repawut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c164f48d-d08f-40d4-8f51-ac9ac969601b/97458447236.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/so_bernardo_graciliano_ramos.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/airline_ticket_template_microsoft_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef581b6-3638-4f24-a338-b10c5d35f786/taripalusujobasad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc14d20a-51c7-4a83-bb0c-d32f23a6479c/bhaja_govindam_lyrics_in_english_m.s._subbulakshmi.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/digital_photography_ebooks_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/iet_ceng_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/zesobimapi.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_off0001c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C780 5132 bytes
SHA-256: ee4d92aead5113226897354e264939a27aeb883c4c3e9232cf69fe86c1a5e01b
font_01_sfnt_off0001d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8D8 13920 bytes
SHA-256: f09a4ec37cd0db4a04fea94d118103fc836d4ed5fe9dd0eec3b34b4176e05be3

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