Malicious PDF — malware analysis report

Static analysis result for SHA-256 5883aa655a2a20d0…

MALICIOUS

PDF

76.8 KB Created: 2021-04-05 00:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c8e283bccd13b7d5edef71df734860a7 SHA-1: 3e9c3f1a24aac1289a488a8860681263b51ab42f SHA-256: 5883aa655a2a20d0b1aa0c1cbf04b53088b9b9f7a9b49e5ef5cd4fe6884b1997
134 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to present a deceptive call-to-action. The embedded URLs, such as 'https://mezovovuduw.ru/award?keyword=how+to+rearrange+page+order+in+pdf', are part of this lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=how+to+rearrange+page+order+in+pdf PDF link annotation
    • http://deliwubavamir.mypressonline.com/fepibabom.pdfIn PDF document text
    • http://discount50it.pro/872751671122nkig.pdfIn PDF document text
    • https://cdn.sqhk.co/samuxoruja/jjpieRg/addendum_to_rental_agreement_form.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/hcsmii3/wolf_girl_anime_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_60149eb8b147b.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/67064839325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc8866ad4fcb.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/68325294687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_60201a819255b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_60224d94dc76d.pdfIn PDF document text
    • http://legendbilisim.com/6th_grade_end_of_year_math_assessment081f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382773/normal_5fe52c90a183f.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/ic9d6gd/bekubulugutegimupabimub.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/3FCidQj/cannonball_tv_show_location.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/h5GnTBF/vesewusuvijaxesadu.pdfIn PDF document text
    • http://expressvpn.store/cracking_coding_interview_githubgqln9.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/67ef5de6-1d26-4b8e-b311-0a855caa9177/34721740677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf274cf-1b23-4f19-abbc-351c1e13b2ac/mudinuvaxulowenuvuzotokuf.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/xanadagibuxateluj.pdfIn PDF document text
    • http://gupatevefojip.myartsonline.com/99700807094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf55e58-87dd-4530-bcae-4a14a25259d1/nike_air_force_1_valentines_day_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e90b28-e08a-4e81-b76d-326540bbc89b/what_does_gdp_per_capita_tell_you_about_a_country.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/how_many_calories_in_a_krispy_kreme_chocolate_donut.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/blob_tree_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad25169e-ac88-4e78-8655-1080c585b30c/76418924112.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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 5052 bytes
SHA-256: 728309a8c73ba0cb2304f1db8fc267f50569c3f2bd8ba81d1ea5c4094958a188
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 10760 bytes
SHA-256: f95df4c037d08948fb9ca5f47236399ec836dfed9f6e08d2f98518c542f1a9ac