Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95e6842b29bf4b3…

MALICIOUS

PDF

100.4 KB Created: 2021-03-25 06:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a50f8d74efe681d770e6224d0aacfd3c SHA-1: b1f5e4a295e6279825ae6dcdb827c4ce0a840ae9 SHA-256: f95e6842b29bf4b3ee3ac4c9e45ba1353dd45c7b00263a53a0a2a16f76956cb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=ethylene+glycol+production+process+pdf PDF link annotation
    • http://duwinijuj.mypressonline.com/jaxulozixojanugisi.pdfIn PDF document text
    • http://freud.icu/sim_card_templatexpj0u.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/525031287323luyk.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/netters_orthopedic_anatomy_anki.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/sodubavefitet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_602fb9db23d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_5fd9cbeab274e.pdfIn PDF document text
    • http://marketes.pro/pedometer_app_for_iphone0kt8c.pdfIn PDF document text
    • http://russianpatentexpert.com/810079682383k430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_602fc7b03f3a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/pafalepemowoxuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153cd87d-50a4-429d-a3b6-31704b22709a/el_principito_libro_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e798b7-d1f8-4e3f-8a3c-f25958515dbd/modern_calligraphy_alphabet_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/day_end_report_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/94170843889.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/metformin_dose_for_prediabetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e8c0cb-7cf8-47a8-90be-50a003298af8/the_painted_bird_full_movie_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e13d2f-b06b-45fd-bae1-1588dce4d2c0/41503061641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b39a2a-8ea8-47a9-a309-c433d64f1393/50403257758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9099b93d-b918-411c-96b8-f97bde566a03/how_to_build_a_house_simple_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669723fb-61ec-4c4f-8ae9-764a49e33b25/harry_potter_2nd_movie_length.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 6492 bytes
SHA-256: cf6bcbaf462759e04676f8989e7e87ed4d43c4317550ddbd0c5684ab0bd17b73
font_01_sfnt_off0001466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466F 5268 bytes
SHA-256: b89bde4051ce4e9d20757c5c4e056528a3ce827d5dc684c6eb8cf9b0dac70fba
font_02_sfnt_off0001586e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586E 13436 bytes
SHA-256: 8ea6a3da510935ac690421f8fc2da8e01924504a157f3b7ef823dde15152d1bf