Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d30eca44b4e555…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 00:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60037784f13f3f6ae73700db9031e963 SHA-1: 035930b55dacd9b4c7ffb11be8092357eee45a25 SHA-256: 02d30eca44b4e55554d58d9e275ae3df6cc54d789062dda491463fb15e13db17
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, with the primary suspicious URL being https://nipisod.ru/wix?keyword=lop+hoc+vui+nhon+khoi+my+kelvin+khanh. This pattern is often used to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=lop+hoc+vui+nhon+khoi+my+kelvin+khanh
    • http://oneitstore.info/mosumazitisenusozemusofed14zcd.pdf
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/9724898.pdf
    • http://azakalaza5.xyz/hansons_marathon_method_review16558.pdf
    • https://cdn-cms.f-static.net/uploads/4413850/normal_603ab2544d1c7.pdf
    • http://catsism.com/moonlight_serenade_piano_solo_sheet_music9ooye.pdf
    • https://senolotazafam.weebly.com/uploads/1/3/4/5/134597296/5317265.pdf
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/worexalolejitaseb.pdf
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fd653272e1ad.pdf
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/7625996.pdf
    • http://fabulouss.space/ai_hashtag_generatordaydt.pdf
    • https://cdn-cms.f-static.net/uploads/4381529/normal_603348998d997.pdf
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/10b09b9047.pdf
    • http://alifan.store/how_human_beings_depend_on_environmentv2zil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dosipive/30433149662.pdf
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_f38d1fca0c9e4aa4b8ff5a28ffd78cee.pdf?index=true
    • https://s3.amazonaws.com/lixisariwulo/fepolefipajoliwetofeto.pdf
    • https://s3.amazonaws.com/fajixe/achilles_pain_exercises.pdf
    • https://s3.amazonaws.com/fezenur/how_to_make_all_tables_in_powerpoint_the_same_size.pdf
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_5354defcd0564a1dac705ac1ee89dd60.pdf?index=true
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_3c371d5d6f49409fbdab858c51851216.pdf?index=true
    • https://s3.amazonaws.com/tugabijenovili/sears_kenmore_sewing_machine_desk.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d538.bin
81021c405abff7be9ba93b2ad57028bc22cd05a69f916625aba84011de9c32d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 5064 bytes
font_01_sfnt_off0000e668.bin
9e8de39d8940cf0c31893fd33327ed59da2f3da4668cd3abf3b032b59f004bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 20252 bytes
font_02_sfnt_off0001166f.bin
a9f6326a729d4c2491a887abc242d041cf4eeadb800e142f022568f2c45af694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16124 bytes

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