Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ceb80815b4bc53c…

MALICIOUS

PDF

82.2 KB Created: 2021-04-05 03:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31a59abfee2feffe3d948fa227f10d67 SHA-1: 8029bc218fa4224473541b782472d9df8fc98a7a SHA-256: 9ceb80815b4bc53c2c008127231e8057803da5c06aac1331433e4e516214b7da
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many pointing to benign-looking PDFs, suggests a link farm designed to obscure the true malicious destination. The primary malicious URL identified is https://druttle.ru/wix?keyword=fujifilm+finepix+ax650+manual, which likely serves as a lure or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=fujifilm+finepix+ax650+manual
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/2205382.pdf
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/komige-migisiwurawigut-bojifiziwexuk.pdf
    • https://giwonogudere.weebly.com/uploads/1/3/4/8/134872327/7a7205b495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dorulusof/colt_ar_15_sp2_serial_numbers.pdf
    • https://uploads.strikinglycdn.com/files/648a3efd-4808-403b-b2fe-3aaa6750ef8f/82083438876.pdf
    • https://s3.amazonaws.com/fedufiporara/my_talking_angela_old_version_apk.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_0d3a3373e98f416a9b2408754f790a76.pdf?index=true
    • https://s3.amazonaws.com/tetofamuxulil/movies4me_bollywood_movies_2019.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_94e8d107161344db80fcc8373d8db3ca.pdf?index=true
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_70d9113ecc824507967476a4140470d0.pdf?index=true
    • https://s3.amazonaws.com/vavejijitatofu/britain_s_got_talent_app_apk.pdf
    • https://s3.amazonaws.com/wetevali/what_was_the_pax_romana_and_why_was_it_important.pdf
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_b43f2462e4204686b6916f563ffd2c7a.pdf?index=true
    • https://s3.amazonaws.com/somamere/gonotovi.pdf
    • https://s3.amazonaws.com/pazatuv/frayer_model_example_multiplication.pdf
    • https://uploads.strikinglycdn.com/files/cc9ffcf8-5f69-49b7-acf2-c3db2a7ecda3/reponozuvix.pdf
    • https://uploads.strikinglycdn.com/files/17708abf-4cd5-4443-8422-6220eae5e90f/2383616870.pdf
    • https://s3.amazonaws.com/vanatul/uniforme_colegio_aleman_valdivia.pdf
    • https://uploads.strikinglycdn.com/files/ba827c3d-2678-48c0-8fa0-86d372364d19/fafasulaguke.pdf
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_7ae6235a3ab242dd912e8dd0ee47fb04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c41fd12-9ea8-4aa2-9dbf-fa709f9870aa/how_to_prepare_brownie_pan.pdf
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_bbaf8eaa2bed49f9840564123b7870e4.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f659.bin
c250b153361b9870f67805e980a9e8702e22d21ab028ea26d41ba1376ff51c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 5292 bytes
font_01_sfnt_off0001085b.bin
a3f9f8e676380f377d8146c9debf55a9b15f9a43afd328abf6998da7c5be1592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 16080 bytes

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