Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c5afcc525e06a2…

MALICIOUS

PDF

77.5 KB Created: 2021-05-06 11:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1f9bd4521f525efed4ba1cb40ae9907f SHA-1: 80a98957a8fa857390e1759c4f6868f4454bb3b0 SHA-256: 35c5afcc525e06a2e4b27d0c40fcbb969b6a5d87253f5398b833dc84d2917747
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the nature of the link farm and the phishing classification point towards a malicious document designed to lead users to compromised or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=harry+potter+2020+advent+calendar+characters PDF link annotation
    • http://kulinar2020.site/bella_durmiente_cuentoc5tpi.pdfIn PDF document text
    • http://mantenancie.com/eric_berg_food_chartauhal.pdfIn PDF document text
    • http://clyb-wylcan3.space/pot_video_player_32_bit_freeqjgg6.pdfIn PDF document text
    • http://tryplafond.xyz/un_puente_hacia_terabithia_personajes_libro2n814.pdfIn PDF document text
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/26d875.pdfIn PDF document text
    • http://saleproducts.pro/jovasonapusawudurujumuz3xui.pdfIn PDF document text
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/507636ff5376.pdfIn PDF document text
    • https://cdn.sqhk.co/pawapoma/cXP3ahd/26384100302.pdfIn PDF document text
    • https://nokabukewodujam.weebly.com/uploads/1/3/0/9/130969525/eb53b1795492.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/AhdaZih/gosutiwoxefevodikutigo.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/mkpicms/60901328572.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/ighdyib/pay_amazon_store_card_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/ghbojan/97615889541.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/kSigigY/zudixanakav.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/voropa/longitude_dava_sobel_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/moon_phases_worksheet_6th_grade_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/nosadurafezi.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/sigmund_freud_dream_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/pasukepoxijezufuwuxepon.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/higbee_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/tadog.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_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 5560 bytes
SHA-256: 1e938574326f7c5a3820911e4216a94a4e2a8df133fc2f5e70bf7bc7c2e956e4
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10996 bytes
SHA-256: a477d7c7698b9592460b2384ca028d01d8055e9992bf17f488826d8900533463

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