Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8f1b6378880bb2…

MALICIOUS

PDF

74.8 KB Created: 2021-03-27 17:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0cab8d8af131e342fa2abd697a265d6 SHA-1: 2c8b1e5713081be53e1d87d90c9a5f520259e18d SHA-256: ea8f1b6378880bb2d65e623fc27f27482364cade8c81f2589ac86c28e6b5a598
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm detected by heuristics, suggests the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and the nature of the links point towards a phishing or SEO spam attack.

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://ponafet.ru/award?keyword=partial+differential+equations+avner+friedman+pdf
    • http://reduslim-italiaoficial.site/troy_bilt_weed_eater_wont_run_full_throttle2my5m.pdf
    • https://refodalisa.weebly.com/uploads/1/3/4/4/134437853/7541510.pdf
    • http://goodshopsales.xyz/why_did_the_lady_of_the_lake_kill_merlinffklp.pdf
    • http://pankreatitum.ru/editing_exercises_for_class_8_with_answersoa19c.pdf
    • http://garantiya62.ru/159466141265mfqk.pdf
    • http://ericksandoval.com/53217141828vn3iv.pdf
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5ffe25a61119e.pdf
    • https://texapusozos.weebly.com/uploads/1/3/1/4/131407592/laretokidane_xoxepog_wujof_lodizijeg.pdf
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5fef3436cc04c.pdf
    • https://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/53287e3f.pdf
    • http://legiontry.online/crucial_conversations_awkward_performance_reviewyxdy1.pdf
    • https://gowajepev.weebly.com/uploads/1/3/4/9/134900038/3910116.pdf
    • http://prizinsta.site/free_chat_rooms_to_make_friendsa7ovn.pdf
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fee8713a6fd8.pdf
    • https://nenusobodi.weebly.com/uploads/1/3/1/4/131406558/4348513.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5fd0f087e6679.pdf
    • http://sfhgfje5df.xyz/note_3_price_in_bangladeshzvbnr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_ac64f592b9de40ccb458060dc0e4271c.pdf?index=true
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_b514ea3cbd4f4bb2af1168ac29aeeab7.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_ccebede49b69427d91751926231e2ee0.pdf?index=true
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_0f1e4b48d99740c08bbd13c4466b6c54.pdf?index=true
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_2ab93e0a5f6847e7af3be3b93678a820.pdf?index=true
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_99b074836a534eb6b3e11bd1fe922329.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e449.bin
3e15edbf0b20ccc7b06654fbbc7cd4e89cf0134c2ba1237d7ce14412f0dfbd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 5376 bytes
font_01_sfnt_off0000f67f.bin
26c5e71f2dfc0a92443ccf6b4cb0c378744edc2dcb7aac98349b5ad09736670c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 11360 bytes

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