Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80275381e38a380…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 19:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b3451243a03e4b008d4ad8eefc58f8ea SHA-1: 9d134399be2277e07e9487eb98cc0d156311cc30 SHA-256: a80275381e38a380db7e8b66ac7b390b0dc1f6a480e3904c7ed6a87ab3f02221
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/wix?keyword=lesson+3-2+practice+b+multiplying+polynomials+answers PDF link annotation
    • https://cdn.sqhk.co/tikalijit/ejcV0rm/chemistry_notes_for_neet.pdfIn PDF document text
    • http://topitoxituzoju.iblogger.org/84458108221.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/mavamazeteluw_pizatagewut.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/bhjgiif/88012611061.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/ii2ghhj/business_card_template_psd_2019.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/rexejapofuzipimafi.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/hegeHjb/download_big_battle_3d_mod_apk_android_1.pdfIn PDF document text
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/dijofoxaregosebib.pdfIn PDF document text
    • http://gumimexolekedid.22web.org/in_feng_shui_what_is_the_best_color_for_a_bedroom.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/ycZwwje/98498676451.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/core_java_interview_questions_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_5fe8cc863bd43.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/80501065587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5fd79929db97d.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/8667943908.pdfIn PDF document text
    • https://vawigaxonisas.weebly.com/uploads/1/3/1/4/131438461/2cf56adfe088d.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/zinubenegug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetovokerug.epizy.com/dimobuwix.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/c_for_dummies_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/inequalities_word_problems_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/akh_lad_jaave_video_song_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/29328608334.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/green_charge_managing_renewable_energy_in_smart_buildings.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 5856 bytes
SHA-256: 20ce21a14dc7101ed981c6f38d6b389675c04f0160f6448d5b63ab7298efcb25
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 11820 bytes
SHA-256: 716ca8aa2dea1afaec9c882f3a05c2a3769491fdb2abdcabf832a59bb5495c97
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16144 bytes
SHA-256: 79c8627a773e437abe6bdf561555e21f51dcdcd0ccca4389e4ddd02436c95492