Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67dcbc20ee15056…

MALICIOUS

PDF

83.2 KB Created: 2021-03-03 12:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c8930359a4601275bc9ba4171c71b618 SHA-1: e84e6879b577a5428112a686df6aef37897830c0 SHA-256: a67dcbc20ee150565361718320a3bbbdee722bd83cc25f1a1e293a0704ffc968
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=nil+lynne+matson+pdf PDF link annotation
    • https://cdn.sqhk.co/wuvidomanale/ibiaCGB/44876284404.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/b3B0gc1/65994621398.pdfIn PDF document text
    • http://yatvoyya.fun/45565582940g4axd.pdfIn PDF document text
    • http://japancar-sib.ru/desigual_mens_size_guide23xur.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/gjhgghh/kumivukofibigolenavimovi.pdfIn PDF document text
    • http://shopbest.online/what_is_the_meaning_of_the_word_etymology_as_it_is_used_in_this_audioqxufe.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/the_other_side_of_midnight_book_quotes.pdfIn PDF document text
    • http://laulu-go.ru/985078016396scq4.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/ap_studio_art_2d_portfolio_requirements.pdfIn PDF document text
    • http://ontrade.top/carl_jung_red_book_englishtkr1d.pdfIn PDF document text
    • http://gratoramaa.space/rush_hour_2_full_movie_youtubepi57c.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/gAFrVjc/vevejo.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/sears_catalogue_houses.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/68290256435.pdfIn PDF document text
    • http://wgathering.org/kayla_itsines_28_day_healthy_eatingvatvs.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_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 5164 bytes
SHA-256: e703f1f144fdf0b2c2b7042a59625e261ebd65cf90fb5eaca174b9430413d6f5
font_01_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 10304 bytes
SHA-256: 3e6aa00890ac08fe82298c42183ffae0014a20aecc5ca5419fff40ff5a038277

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