Malicious PDF — malware analysis report

Static analysis result for SHA-256 d804a48011b28029…

MALICIOUS

PDF

87.1 KB Created: 2021-02-15 09:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7ac7fc50f2b148fac5e77068f6996ad2 SHA-1: e3a0c47e5afd58d6258717cc0a52063155bd9539 SHA-256: d804a48011b28029b8bf6e4bdc162736896745dee3f6e7630892208dd5e224ba
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'captions for engagement photoshoot'. The presence of numerous links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=captions+for+engagement+photoshoot In PDF document text
    • https://cdn.sqhk.co/tefozakozup/Cggzmhc/40064229519.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/VjLjbeu/rnb_music_download_2020_fakaza.pdfIn PDF document text
    • http://sagokorize.22web.org/acute_upper_gi_bleed_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/caUgfSY/godzilla_kong_size_chart.pdfIn PDF document text
    • http://pipazodonuwadu.iblogger.org/nepit.pdfIn PDF document text
    • http://kurekarer.22web.org/lazasufitarukajitobuvixog.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/danupepupabawogurezokas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxexi/segmented_bar_graph_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/debt_payoff_snowball_calculator_spreadsheet.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/quiz_logo_game_answers_level_spain_2.pdfIn PDF document text
    • http://fufebelanamug.rf.gd/12058319009.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/assistant_sales_manager_interview_questions_answers.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/bal_hanuman_akdam_bakdam_video_song.pdfIn PDF document text
    • http://bivadalov.epizy.com/nivemudabonisonefufevi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 6588 bytes
SHA-256: c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 5188 bytes
SHA-256: 935a66ad462552f15ba9025a28cf91440f4d7042c41af0fc71a91a95d888020d
font_02_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 2448 bytes
SHA-256: f33c89ff430dd13fa58e1ca7182cae3eb0dcd5a4957d858a2f3e5543239c1816
font_03_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 10640 bytes
SHA-256: 709e9c9d6e360f7c11b93a82d613f7a0ef89eca29b08d4fe5963dd7f766e4bef
font_04_sfnt_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3