Malicious PDF — malware analysis report

Static analysis result for SHA-256 863dec6596dc9af3…

MALICIOUS

PDF

72.7 KB Created: 2021-04-05 16:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d8c68465c01f6e979e3e4fd341305a18 SHA-1: 72f78f7e40900c78fa6bbb1b6a09a482aefbb0ff SHA-256: 863dec6596dc9af3a08139ff7eab9c76f645972a903fb856e069d51675b62433
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=understanding+unix%252Flinux+programming+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422628/normal_602d7effacc17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5fe081a6176d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_6033536a4b97c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469116/normal_5fff49cc2e9bf.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/1a343f988.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/tesuvi_fexoduju_zapedane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_6029b50b30d81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vukumesoj/coldplay_paradise_piano_sheet_music_free.pdfIn PDF document text
    • http://rerodijunenema.epizy.com/chicago_manual_of_style_guidelines_quick_study.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/clinical_trial_protocol_template_eu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361b9ae1-b920-4ce3-9117-408b2c2c9fc3/dell_optiplex_790_core_i5_windows_7_desktop_3.1_ghz.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/colons_dashes_hyphens_and_parentheses_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/beyblade_burst_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/thawing_frozen_breast_milk_guidelines.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/memodorun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15150719-e331-4d9d-b009-6898a52be317/nizivuligiwofuserodimotov.pdfIn PDF document text
    • http://bozolukiket.epizy.com/wobevigozasexafukinu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/adblock_plus_for_android_4._4._2.pdfIn PDF document text
    • http://zijomofi.epizy.com/essentials_of_business_communication_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/bbc_good_food_guide_chocolate_muffins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e0fbc9-9804-4668-b140-bd955b1846e4/iphone_5c_price_in_kenya_2020.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 5340 bytes
SHA-256: a3866468fc19a54ab08d27a7731d5bbedd1fa4d43a973680de2b106d91a3687c
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10544 bytes
SHA-256: af61964aff180e7592aedd4e496bc11857b304f2ba33a5d92ab89046e64f601d
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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