Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37e6b94c2e5d254…

MALICIOUS

PDF

69.9 KB Created: 2021-02-03 03:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dc4e0414059cb9d02702516e8af7e14d SHA-1: c8db8ea3e34afcc4fa03ca4a1b97123812402915 SHA-256: d37e6b94c2e5d254c51e8afcd2002cec9109068765e4cc04a8e9422a34e5f756
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=activity+2.1.2a+understanding+robots+answers PDF link annotation
    • https://cdn.sqhk.co/mibajufaneja/ghClvJ5/trending_hashtags_for_instagram_likes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447251/normal_5fec7cda03d9e.pdfIn PDF document text
    • http://trendmobile.ru/hp_deskjet_2541_all-in-one_printer_copier_scannerf3obx.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/N3IQcgf/d_day_date_pearl_harbor.pdfIn PDF document text
    • http://instapriz24.online/impossible_motor_bike_stunts_2019_mega_ramp_gamesxj8c2.pdfIn PDF document text
    • http://sreda.city/entry_level_accounting_interview_questions_and_answersk3e94.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/R6Wjijb/sepowafozefet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fdee46bbf525.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/ejeQoge/furemutifupejo.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/hjiehgS/traductor_de_idioma_aparato.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5ff64b7e988cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_600c88c4602e0.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/exjagcz/57315631704.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/gfWidgf/95610317376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5ff528c05a253.pdfIn PDF document text
    • http://vermono.site/redact_adobe_acrobat_standard_2017sa3cg.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/9545137.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/OrZjgjf/kasulum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 5672 bytes
SHA-256: 455e844a62e44a4c98f75eddfa23d708e8401e6b2c87efc85ee3bbcec75db7ea
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 10400 bytes
SHA-256: ebf69f52324eb73a0242c11635bf8208058cf2abf1fd463076f15323937228b2

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