Malicious PDF — malware analysis report

Static analysis result for SHA-256 b475bf33c4fbd60a…

MALICIOUS

PDF

80.3 KB Created: 2021-03-30 13:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63ba312321e6412697fac3a33241ca2f SHA-1: 4224b3400acffabfaf18cefee5019c5ce17775e5 SHA-256: b475bf33c4fbd60ac14cc023b40dd0dec68a3731931874c61d708c7f4a683cfd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to link farms, indicating a malicious intent to direct users to potentially harmful sites. The ClamAV detection and ML classifier strongly suggest malicious content, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/aws?utm_term=rca+galileo+pro+android+update
    • http://ketibenugato.22web.org/687387268.pdf
    • http://masarutaboranar.iblogger.org/zidoduvufezugep.pdf
    • http://xaninivinekeni.iblogger.org/cant_enable_web_services_on_hp_printer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kudogal.rf.gd/what_is_the_hermetic_philosophy.pdf
    • https://uploads.strikinglycdn.com/files/08393300-7d79-44ea-81f5-7759d2b97206/98319712205.pdf
    • http://dusetelonuzaj.epizy.com/fijovagenepusesobotetoma.pdf
    • http://kamegil.epizy.com/memento_mori_definition_literary_term.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_08370499b0ae463bbf6ab1333736503f.pdf?index=true
    • http://babazemo.epizy.com/input_file_accept_and_image.pdf
    • https://uploads.strikinglycdn.com/files/6b53b565-229a-446e-a206-c861c75fd2d8/88129342968.pdf
    • https://uploads.strikinglycdn.com/files/9908cc77-7be3-4130-847a-f17971fce758/53385952964.pdf
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_e5c7c846b20f46fe859f8a9155bf6374.pdf?index=true
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_5fb1c88715884c03b1184132478beaba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8b3b2e3-93ad-42e6-9c8e-6afc38b58de3/learn_more_ka_matlab_kya_hota_hai.pdf
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_4f2e5e9ab45a43319c6dfcafdcf36193.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d183f0d-c47d-453c-86c4-f1ec65bf841b/vapoligumubaf.pdf
    • https://uploads.strikinglycdn.com/files/c88187ec-bceb-415c-9b2b-66790d23b7eb/ode_to_aphrodite_summary.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_48d6587ea9a94fb7a520a1b5946eabf8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8525f41-55df-46f4-887e-508fd6a7f001/the_complete_book_of_tai_chi_chuan_free.pdf
    • https://uploads.strikinglycdn.com/files/a022f556-6262-4bef-ae0c-03701f432bd9/nikisegenopodezarupimelow.pdf
    • https://uploads.strikinglycdn.com/files/3c50195c-296c-41f7-bf98-715dbf7d4024/dell_inspiron_n5010_drivers_for_windows_10_64_bit_free_download.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_868941390e52499590316a34ed334ad1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef67.bin
2379367a8e8ecfc96469821ed503f4202ceb449412daf74ca1473feb82f490e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 4952 bytes
font_01_sfnt_off00010048.bin
b3808722058b0e478f54cf6e2101601567d87f1c57bd5234dc09f23fd8d48bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 10992 bytes
font_02_sfnt_off000125b7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 4324 bytes

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