Malicious PDF — malware analysis report

Static analysis result for SHA-256 e738039f59367923…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 13:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7c1d77491a3eafe2e01429c6f4bed6fa SHA-1: 5b5128f150dbe3126f9452fec92ad65faf868176 SHA-256: e738039f593679238516a5c9a4dd3f75235c932885f1f60ca46511f234d4e395
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 0.9997

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://leonvi.ru/award?keyword=faringitis+estreptoc%25C3%25B3cica+pdf PDF link annotation
    • http://rusherx.studio/cnn_news_today_live_streamingckiv2.pdfIn PDF document text
    • http://unonatur.space/aa_4th_step_worksheet_joe_and_charligkrib.pdfIn PDF document text
    • http://copyrightreports.com/30_day_challenge_food_and_workoutqkeko.pdfIn PDF document text
    • https://jonimewogil.weebly.com/uploads/1/3/1/8/131860125/4c5d9c.pdfIn PDF document text
    • https://cdn.sqhk.co/bomenojosa/bjigcig/bloons_td_5_apk_mod.pdfIn PDF document text
    • http://bonboxstudio.com/what_book_comes_after_warriors_of_the_storm63698.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/cgegcfK/vakuga.pdfIn PDF document text
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/liwededomad.pdfIn PDF document text
    • http://casser.xyz/latox9yoku.pdfIn PDF document text
    • http://blacklaser.ru/939658280894789c.pdfIn PDF document text
    • http://rimka.xyz/is_the_keurig_water_reservoir_dishwasher_safeqaf7n.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/iigcicv/fall_out_boy_clothes.pdfIn PDF document text
    • http://itslm.fun/tavokoguweyozl1.pdfIn PDF document text
    • http://world-wild-shop.com/how_to_use_washing_machine_lint_trapd12o1.pdfIn PDF document text
    • http://bigpleasure.ru/sukilugenazopowitutuskrwg.pdfIn PDF document text
    • http://teplotronic.ru/juderekofunutiwose11g74.pdfIn PDF document text
    • http://enots.space/shakalaka_baby_songhtvds.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/sevoga/alphago_paper_nature.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/guideline_hyperuricemia_and_gout.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/what_made_james_baldwin_famous.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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 5380 bytes
SHA-256: 86095e1604d4e0808e90a02d4cbd6ad3d7c722789510dbb93f830179599c283b
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 12540 bytes
SHA-256: 80e6d0b99f3e3fc0210180913d372d72c7b8a38f948622d92d99ca84ec69a950