Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2fccb925f8518d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 19:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 43e46958294035da1cbed43f8d5bb2a9 SHA-1: 2189924e46128f6d92136e5f1f20cd67afdcb353 SHA-256: 3b2fccb925f8518df3b9e6668997d0281bb59011cd2e5be0b4118ebc36a945ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one suspicious URL pointing to 'bologen.ru', suggesting a phishing or link-farming attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a bursary application form. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/award?keyword=reap+bursary+application+form+2020+pdf PDF link annotation
    • https://sixamipad.weebly.com/uploads/1/3/4/7/134726782/xarevanujubude.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/h4Uiev9/2704938821.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/d4cddd50.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/togunekisilo-ponew.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/angegjX/19402190422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_6857ca40da874d64acd673966b972c10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/endless_love_sheet_music_duet.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/ccna_student_lab_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/captel_840i_telephone_manual.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_274c9b3df3694b9fb7601bf68face8bc.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_d27b02da2bf9474094ce0437424c2809.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_b0324198b00b490faf1e627a8af9b9cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pigolo/how_to_answer_happy_birthday_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/bollywood_songs_mp4_2017.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_c61258dbeea646de8a0400d00192f945.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_225558ec714d42e1b1755aa79677514e.pdf?index=trueIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_eb83926c5b5e477798eeb2be25bba693.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_e2dbe3a810454362a86f6ea71fd9695e.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 5824 bytes
SHA-256: 8470d36e4ee65f410e34d4e2d2e474da0058f2f29b516ad2bac60afec3ad7c4d
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 11144 bytes
SHA-256: 783d30dbd566fdbc0a48b8d4994325edc2b149d1c1919d0307e140294443c693

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