Malicious PDF — malware analysis report

Static analysis result for SHA-256 1600dc818806cb3c…

MALICIOUS

PDF

77.8 KB Created: 2021-06-07 06:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbcfb857db5c5c394cc10730144af0c1 SHA-1: 08b21931f3e1a767ac33b27016058192a8575f83 SHA-256: 1600dc818806cb3cd6f6ad38b749c41a1a8a423500d408c1d19e1d7b899f3888
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 pointing to Weebly-hosted PDFs, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/pbw?utm_term=simple+flower+colouring+page
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/kujumeguboxekofog.pdf
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/kewawikev.pdf
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/ganokowitekesopidawu.pdf
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/kabosowarivatemoz.pdf
    • https://wilepojaxuxag.weebly.com/uploads/1/3/4/6/134682450/9220594.pdf
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/3678811.pdf
    • https://xuloxaxofe.weebly.com/uploads/1/3/5/2/135294954/jetudi.pdf
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/duzaxopedux_migebanadu_bevodalu_zepezigusisebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a555fb46-9bfa-4723-a113-07bd38a3dc8e/how_to_make_homemade_pizza_dough_without_yeast.pdf
    • http://ziludezubeju.pbworks.com/w/file/fetch/144464136/how_do_you_write_a_reference_letter_for_an_employee_leaving.pdf
    • http://giwupiraride.pbworks.com/f/mexiguponesu.pdf
    • https://uploads.strikinglycdn.com/files/d264fb4e-727c-496b-8804-cb6f2b83023f/64407359232.pdf
    • https://uploads.strikinglycdn.com/files/49093e9a-68ff-446b-897c-b92b277195c8/shoretel_230g_manual.pdf
    • https://uploads.strikinglycdn.com/files/925d4f8d-439e-4a26-9de5-d53c2500dc95/60478970285.pdf
    • https://uploads.strikinglycdn.com/files/acd39ed0-e2f9-492d-b8f8-819480f0c075/vekesodegapokiwukisikal.pdf
    • https://uploads.strikinglycdn.com/files/d41d2a6d-ca91-4713-8384-d0c392017291/flip_video_camera_how_to_charge.pdf
    • http://wenuveraroto.pbworks.com/f/list_of_strengths_and_weaknesses_for_job.pdf
    • https://uploads.strikinglycdn.com/files/9047c04c-e283-41e5-b70c-a7de3a24cf4d/totedeleni.pdf
    • http://litorabi.pbworks.com/w/file/fetch/144489639/5421581152.pdf
    • http://fudejob.pbworks.com/w/file/fetch/144576729/54443175789.pdf
    • https://uploads.strikinglycdn.com/files/45a03c10-c297-46f5-8ca9-27147706a839/how_to_use_a_cardio_glide.pdf
    • http://juvupumanut.pbworks.com/w/file/fetch/144498273/rivopunesaxuxurubolufavo.pdf
    • http://nigezid.pbworks.com/f/how_to_make_pacman_scratch.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cc.bin
915bf6dd0cd05839aaf4d605af7be2b2c698f6c3d1f83637a28d380b9e37a8ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 5352 bytes
font_01_sfnt_off000102ff.bin
190a8c3835a5bae7ca63c08859fb183f8e13bfc970c61b26b299e537f094b9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 11620 bytes

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