Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73c704c2018db73…

MALICIOUS

PDF

96.8 KB Created: 2021-03-14 01:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 27b99377f5e0212b6a8fc26392218c8a SHA-1: 51f99e7a929ff72a77a2a1eb9072c75965499eb1 SHA-256: a73c704c2018db73c53acff0155c02eec4fb36c2aa4264d7947ee31799e4b72e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary URL, https://mezovuduw.ru/award?keyword=career+after+12th+science+pdf, suggests a phishing or SEO manipulation tactic. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of the file. No scripts were extracted, but the structure points towards a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5653

Heuristics 6

  • 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 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mezovuduw.ru/award?keyword=career+after+12th+science+pdf PDF link annotation
    • https://cdn.sqhk.co/tudusiki/qrgheje/network_q_rac_rally_championship_1996.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/ZKTWfRv/action_camera_drivers.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/30161954601.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/fegokusufazifep.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/2020_calendar_uk_printable.pdfIn PDF document text
    • https://luzibajaxu.weebly.com/uploads/1/3/2/6/132695572/dijifivaxej.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/28124012809.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/FSidiga/buxudexuwow.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/kusamozivelobivodegutosoz.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/tobufewi.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn 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://fedorahosted.org/lohitIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_f6002f9b1f90428894ea4d958b590d65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd75b76f-ad79-4928-9066-a62a91c12f89/bakitivozume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19313f4f-eaa9-45a4-a5df-875e4c47ad50/are_you_my_mother_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedc74b5-7189-4e23-a38f-fe475113ee04/97424063195.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_f331110416dc4835bdd6a9efe5b96cb1.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_8c723d2b188848d29b2b868d9930a323.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/562072d9-d404-4150-bbb9-d5123f1c64c1/what_are_some_bad_personality_traits.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_5723abfce2d94ebc9c5bc018afcfce40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7291e066-a9f2-4255-9d6f-6e756d42a0e2/craftsman_10_table_saw_review.pdfIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fbc9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBC9 18976 bytes
SHA-256: 5a5a99e4ba518f650f963e6aa9f991b92b885f17d9b584c20085582637343d5c
font_00_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5096 bytes
SHA-256: faeaa1a16a0592f9871a199bf48f38a31b9ed733a7b6ec33e8d40e7301778b30
font_02_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 12608 bytes
SHA-256: be485726ac97b2c2911a27aa90486294d4e95918a0f644135da1ab374df6d6b3
font_03_sfnt_off00015d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D86 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
font_04_sfnt_off00016b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B86 6508 bytes
SHA-256: 3e50856262e60d38178b45cd6c23866041b1ed87b279f6a48896654f36d89f95