Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3aee6ce24a7069…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 11:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 86b7e7813fcf23e4366c7288e007e2e1 SHA-1: 21a40dc4a70f0a65aa255ce2c7d72a3bf1fe436d SHA-256: 2a3aee6ce24a70695f3eb4bbef46865ee786813a3d183e9f736ac3a7d3df731e
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary malicious URL identified is 'https://maypoin.ru/strik?utm_term=how+to+attach+front+facing+car+seat', which is likely used to redirect users to a phishing or scam page. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=how+to+attach+front+facing+car+seat PDF link annotation
    • https://cdn.sqhk.co/fapolokid/jgsIncy/247sports_2020_football_rankings.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/nowopax.pdfIn PDF document text
    • http://beautysss.site/vivah_hd_video_movieyl8ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_5ff78fb55c4d8.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/chbhjVB/is_there_a_vikings_season_6_part_2.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/servidor_web_apache_linux.pdfIn PDF document text
    • http://stal-kemerovo.ru/filezilla_ftp_client_tutorial7j3yg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_601330111c290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fe51794f2f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_6043029a39617.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/fhbnAdR/lemenevewe.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/bKhdiip/lenovo_thinkpad_charger_usb-_c.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/w0ijjgK/bape_shark_cartoon_wallpaper.pdfIn PDF document text
    • http://storeyou.store/cardinal_pole_school_uniform_shopc0wsa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69708b4a-f985-4edc-a3db-1df498247979/lozusoduzawusabid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/793a1331-90a4-4d45-877b-fc7ff88d4d25/kolorigawu.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/xupodekipowuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebb1750-6046-4ea8-9a27-74d739074f87/blackstone_commentaries_on_the_laws_of_england_volume_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17be0b25-7aa5-4412-baaa-9be8b22afcf9/scrum_the_art_of_doing_twice_the_work_in_half_the_time_-_jeff_sutherland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80341fc2-f304-47df-9d5c-0210f5eb1005/why_does_my_co2_fire_alarm_keep_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ec4fce-9b65-4fe0-9e22-f252299a51e5/how_many_calories_in_bob_evans_mashed_potatoes_and_gravy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862a9eaa-943a-4609-b8e1-6a9186f9857b/matlab_simulation_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae295d72-76e3-4f53-a72a-1dcdf2f9984f/93719094643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e94b219-d2a6-4c1f-9e0d-2733f7110e54/durosotijuniro.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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 5164 bytes
SHA-256: 35687019c92111232e1d0756fec5be9b105a5ce521e6834335450b0509fafc64
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 10252 bytes
SHA-256: 1afb2c665304a8b9c0b5d97e8b184cedfbd7f2dc7f0f08b994628ffdae322b63