Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3eb258dd6e1efd…

MALICIOUS

PDF

85.4 KB Created: 2021-03-06 03:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7c7983a8f0f5032b77bdda61b057d051 SHA-1: b14c63213e16629c6be3d929b84c0d5550e897ff SHA-256: bf3eb258dd6e1efda3c2e88f265373e028dda71e41d00da5586e9c8dfa850ffe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/123?utm_term=murach%25E2%2580%2599s+python+programming+free+pdf PDF link annotation
    • http://xegazinijitup.mywebcommunity.org/super_mario_land_3ds_cheats.pdfIn PDF document text
    • http://kismykeitio.best/wild_dogs_australia_huntingn6xpl.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/find_the_fourier_sine_and_cosine_transform_of_e-ax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5ffd9ed0056de.pdfIn PDF document text
    • http://sqrab.top/23165262068howww.pdfIn PDF document text
    • http://italiahot.fun/best_advanced_excel_course_in_mumbailhyzg.pdfIn PDF document text
    • http://saxoxiwu.iblogger.org/gixumebivu.pdfIn PDF document text
    • http://formverifiedbadge.com/comprehension_worksheet_for_grade_60solu.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/the_shack_restaurant_okc_menu.pdfIn PDF document text
    • http://allostar.buzz/mevanizepopimupebejubufanwntsr.pdfIn PDF document text
    • http://urott-hu.com/wewibiruzunakirakvxo2j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371020/normal_5fe286a7c747b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojafeduzig.myartsonline.com/notaxavileruzovakimesava.pdfIn PDF document text
    • http://favigagiwu.epizy.com/41325211925.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/daily_use_english_sentences_in_classroom.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/10598528913.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_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 5696 bytes
SHA-256: 3f858b34e4307943905eaa9bb17530c46063b7b5f5af61e433cabbdf4a14e411
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 11848 bytes
SHA-256: d2fec31086097eaf32b78ed161868e73211a99383e8f1f810a4335721aa310a8