Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02858935a7f4748…

MALICIOUS

PDF

80.4 KB Created: 2021-03-30 00:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef310068cdf2c01d76db763d08a0c10f SHA-1: b028adb73909a56cddfbe09ca708370374c793ae SHA-256: e02858935a7f47481fe5c5aff1c0c9efef97808395254aaca0a9a1138016e4a7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to contain metadata related to its creation as a PDF, and the presence of external URIs indicates an attempt to redirect the user to potentially malicious content.

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://zajinet.ru/wix?keyword=clinical+sonography+a+practical+guide+pdf
    • http://kigumelez.medianewsonline.com/little_alchemy_2_guide.pdf
    • http://fidofawi.medianewsonline.com/diwisemewe.pdf
    • http://takaweri.mywebcommunity.org/eliciting_sounds_secord.pdf
    • http://nuxuzuruguli.mypressonline.com/the_tattooist_of_auschwitz_online_free.pdf
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5ff9cc36388d4.pdf
    • http://tofotibuwul.sportsontheweb.net/biocentrism_and_modernism.pdf
    • http://kowojolajamuv.getenjoyment.net/62458289826.pdf
    • http://joxezorov.mywebcommunity.org/exercise_on_subject_verb_agreement_for_class_4.pdf
    • https://cdn-cms.f-static.net/uploads/4495858/normal_606227cc9e825.pdf
    • http://zodimasar.mypressonline.com/tofazuxixowagajonijumigo.pdf
    • http://rijoginijamibeg.mypressonline.com/zejomawikajitukemek.pdf
    • http://mukoxadetovewo.66ghz.com/architect_bold_font_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/30000550-29b5-4812-bcd3-bac25b1970cb/what_does_a_crp_blood_test_tell_you.pdf
    • http://zixupav.rf.gd/92741549793.pdf
    • https://uploads.strikinglycdn.com/files/f5e72e34-5cee-4e27-bc4b-2f073429392c/53023847572.pdf
    • http://rawigukegopafot.onlinewebshop.net/9_fujifilm_xp80_finepix_digital_camera.pdf
    • https://uploads.strikinglycdn.com/files/7ffc1d3a-b71c-4d87-87a3-6e40d824e3eb/sajalow.pdf
    • http://liraperuwuw.atwebpages.com/absorcion_de_proteinas_bioquimica.pdf
    • http://nubibubimalepik.atwebpages.com/ankylosing_spondylitis.pdf
    • http://katared.rf.gd/do_you_need_weights_for_strength_training.pdf
    • http://wonanikapudidak.atwebpages.com/kadegavilunu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb6.bin
18617e7cc2a2d840527521e465e609ae7a8c13716a39589578773ed13297a40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 5424 bytes
font_01_sfnt_off0000fe1f.bin
58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 6068 bytes
font_02_sfnt_off00010dd0.bin
760264795f75c8fdd0e3f7f8f3b75f97d974bb5ff45ff1de85009b66ce5ac572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 11056 bytes

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