Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c52ddae86df5f…

MALICIOUS

PDF

77.0 KB Created: 2021-04-21 06:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 19dd452931cfb2eb0b63b5c7e36d94c7 SHA-1: 8dfc4e50fc1c7c5c76badbf2a2d33c3751251386 SHA-256: da2c52ddae86df5f5f1f563ab9d50adf25d0bf4ad199a14dcce588e780fa66db
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://jumiwimov.ru/strik?utm_term=for+dummies+pdf PDF link annotation
    • http://ladunosim.sportsontheweb.net/17671299580.pdfIn PDF document text
    • http://menugejonara.22web.org/kelekidesa.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/asvab_practice_test_download.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/how_much_does_a_sony_trinitron_32_inch_tv_weigh.pdfIn PDF document text
    • http://kevareso.iblogger.org/anna_karenina_deutsch_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_604a4d4a237ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_6045c76a61bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_604e6e636b54c.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/jurizemiku.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/ugc_net_books_for_computer_science.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tezonoret.epizy.com/tl-wr841n_router_configuration.pdfIn PDF document text
    • http://tiwemevi.rf.gd/amos_trial_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac6fcdc-a428-4417-a6cb-8a40263b0ec0/how_can_i_get_into_my_acer_laptop_if_i_forgot_the_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98150ec-e19d-4406-9dfe-bd492317ff6d/old_school_rap_concert_in_new_york.pdfIn PDF document text
    • http://soripijadob.rf.gd/free_business_management_course.pdfIn PDF document text
    • http://pufawalaxovosi.epizy.com/jomewowuwufalebebevaxin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f23181-909a-4e06-9316-daa20dbc76c8/jitolonikegoxezubenemofun.pdfIn PDF document text
    • http://ziroroxemigenu.epizy.com/65002005948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7159834-75d0-4dae-a70b-37cefd3a39cb/commercial_refrigeration_for_air_conditioning_technicians_2nd_edition.pdfIn PDF document text
    • http://fipivolakiwupod.rf.gd/bitter_leaf.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/dekunujufisejeruxolazex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 4596 bytes
SHA-256: c0125b2b26f000aec524ab4214d77c2c994296524d158be54c79f4926af1d49e
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 11080 bytes
SHA-256: 96596be0403f00885d3e87a73f6bfbc022b86c6bba141cfa8c0e9c96873bd57b
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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