Malicious PDF — malware analysis report

Static analysis result for SHA-256 322b8b01cbf93fc1…

MALICIOUS

PDF

141.3 KB Created: 2021-03-29 07:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fec62e3ce3258b789445614c111916ae SHA-1: 9585559040821b7f542b9d2878f2a217fb7d14d9 SHA-256: 322b8b01cbf93fc1f5337450348080e9508894f95a0190d3b94c1a05eeea3fe5
186 Risk Score

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 0.9971

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=buried+movie+hd PDF link annotation
    • http://pozuliruz.iblogger.org/c_programming_language_interview_questions_and_answers.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/truss_analysis_method_of_joints_examples.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/96973839011.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/98366778226.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/73629210500kujvy.pdfIn PDF document text
    • http://mugedly.xyz/modern_house_minecraft_pe_map_downloadbdtyl.pdfIn PDF document text
    • http://gratoramaa.space/basher_sabertooth_manualvv9pk.pdfIn PDF document text
    • http://sport-stavki.fun/driver_brt_juken_5vi2rz.pdfIn PDF document text
    • http://xenogogumemikek.66ghz.com/pimifagexewovutibimafuleg.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petojijoxura.onlinewebshop.net/why_my_whirlpool_dryer_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe20c54-14a4-4483-b17a-5053198e8d0d/cyberpunk_2020_release_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488a761e-c432-4476-ab2b-778355c0a36e/how_to_clean_kitchenaid_appliances.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/74629336356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79835e2-c0d1-45b1-bb32-19bc0763dde4/bebinibilesireviwa.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_6056778cd8c347cf92f65b714d281856.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2dd03ec-fe36-46f2-b49b-804981de200a/refuwegesivesibod.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_2663a1675c7e40b4ba2fd8511cbba881.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_95e6e7d22df143f18f6750dbcc678ff6.pdf?index=trueIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_5fd97d6c7d244ae798caca6128d34765.pdf?index=trueIn PDF document text
    • http://tojuzogip.myartsonline.com/sindrome_de_asperger_test.pdfIn PDF document text
    • http://ruwukag.epizy.com/assembly_language_programming_tutorial_for_beginners.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001bd1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BD1C 14480 bytes
SHA-256: bb7d8d8d159ec6f9dd460b03921c27dbc1c17c1a9da239a06205c80b2a93261c
stream_006_off00020ca7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20CA7 17188 bytes
SHA-256: c0c3c0e7d47a7c202fb3af68d768d03fc6b75029f6ef9293fe35ab4aae2e7d28
font_00_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 64992 bytes
SHA-256: 458cc68c5cac665c6bf97164d3d880ed078ed34c4db6b47b504bd90c2c10eb2f
font_01_sfnt_off0001ad24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD24 4752 bytes
SHA-256: 1151708fd1fc94c66e773f06e5e00066a8778fef998e9f345e0980fe4ab2f47c
font_03_sfnt_off0001e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4C9 11832 bytes
SHA-256: 3069aed34c9b59a98339a28a2e5cf806273f119cee8856014b03cd786e0472b9