Malicious PDF — malware analysis report

Static analysis result for SHA-256 693a465961be4bf4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 10:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8cb471ebf19c1361a687abc34b44ecc9 SHA-1: 4ecde1ad6375767d8a989674bd98172a14ca44c6 SHA-256: 693a465961be4bf4f49b133f16688f23afd3085d47d3e5edc815a8e0e1826e73
184 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the embedded URLs and heuristic firings point to a malicious redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=craftsman+air+compressor+parts+pressure+switch In PDF document text
    • http://dedaruk.scienceontheweb.net/cambridge_pet_4.pdfIn PDF document text
    • http://hairhome.moscow/place_value_chart_worksheets_4th_gradebuoq9.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/ihgcoLb/banjo_mix_dj_song.pdfIn PDF document text
    • http://sujolisake.medianewsonline.com/carcinoma_pulmonar_tratamiento.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/hZjcOz2/day_r_premium_apk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424933/normal_5fdd7cc4ac9df.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/80899776461.pdfIn PDF document text
    • http://olivamebel.com/auction_sniper_reviews_2015o173r.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/99154749288.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/to_ride_a_silver_broomstick_by_silver_ravenwolfv1rqv.pdfIn PDF document text
    • http://xsafak.com/john_deere_345_manualjaze7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_6028beefdfd7a.pdfIn PDF document text
    • http://arthromedshop.xyz/what_is_the_term_straw_man_mean87yt1.pdfIn PDF document text
    • http://instasale.company/sabewufimisidaxuxok9q7u.pdfIn PDF document text
    • http://lugabev.mygamesonline.org/the_rules_of_the_game_movie_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_60421f0b1c8e6.pdfIn PDF document text
    • http://topsalon.xyz/dragon_age_asunder_booklekl4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumikowexudat.onlinewebshop.net/wulejawawazimupuzalofa.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/gusutiv.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_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 5220 bytes
SHA-256: 3366f9bed2888283fe9c1dda24f6a95ef239b3cfe28b3a9f9226fc84719c5926
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 11044 bytes
SHA-256: d36ecb0e0409359fec937c1a02ed6edbc07b03d54ca156b1fd4da393d62ac56b