Malicious PDF — malware analysis report

Static analysis result for SHA-256 265f87fd994c59f1…

MALICIOUS

PDF

116.4 KB Created: 2021-05-14 22:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71d4d91c1e56405ead43ccfa8b539879 SHA-1: ae3614acc332e08d31ada966ca76413137a5eedb SHA-256: 265f87fd994c59f1a8b4568a01deec08df1724e6f256245ae5cc7696dcd1aba7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=tc+helicon+voicelive+3+extreme+manuale+italiano
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/mawaj.pdf
    • http://fisijowizaraxot.iblogger.org/kutapenoxa.pdf
    • http://bewilotaweje.mywebcommunity.org/gowexeji.pdf
    • http://xokezuwadem.mygamesonline.org/batangas_state_university_entrance_exam_reviewer.pdf
    • https://sefokasezasun.weebly.com/uploads/1/3/4/6/134690402/9907729.pdf
    • http://kivolugog.mypressonline.com/75980248288.pdf
    • http://xegisurasajem.22web.org/breath_of_the_wild_shrine_guide.pdf
    • http://sawedes.mywebcommunity.org/96559519307.pdf
    • https://xeruzorajudobux.weebly.com/uploads/1/3/4/6/134605969/1648196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2284901d-2b72-45ac-81c5-9ea2cfbd6621/how_to_update_grub_config.pdf
    • https://s3.amazonaws.com/tomamujuf/python_base64_decode.pdf
    • https://s3.amazonaws.com/jopomodilamego/60690319984.pdf
    • https://s3.amazonaws.com/xisefowu/banff_jasper_glacier_national_park_guide.pdf
    • https://s3.amazonaws.com/mejados/43227956035.pdf
    • https://uploads.strikinglycdn.com/files/36bbd005-22c3-4910-93da-08497034655e/how_to_reset_dlink_camera_dcs-932l.pdf
    • http://fibotemirazopo.rf.gd/small_estate_affidavit_form_florida.pdf
    • http://xizefuta.rf.gd/queen_size_platform_bed_frame_near_me.pdf
    • https://s3.amazonaws.com/xufujofaleki/letterhead_template_in_word_2016.pdf
    • https://uploads.strikinglycdn.com/files/e2ea5d86-88c3-4984-95a1-f5f82b695b41/love_poems_for_her_birthday.pdf
    • https://s3.amazonaws.com/rutufokedizon/44158763311.pdf
    • http://rokosarod.rf.gd/changeling_the_lost_second_edition.pdf
    • https://uploads.strikinglycdn.com/files/54f5e713-2e45-429e-9c6b-574c4ceee1dd/31242409609.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017dba.bin
42eb6b8f4529421048ada9c918df13d7eebf25cc50e91d5195809c8858b49e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DBA 4984 bytes
font_01_sfnt_off00018e79.bin
d07cc24256e6dd81eabdd45216c06aa6714c2991bb08d40e690927dee9cc380e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E79 12188 bytes
font_02_sfnt_off0001b5f1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F1 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.