Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a953bdd41553adc…

MALICIOUS

PDF

72.5 KB Created: 2021-05-06 00:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ffe3bd645cfb3a0523017b06819f29d SHA-1: 1617785e870f6a24363f2dce1e7b348292a11009 SHA-256: 5a953bdd41553adcbfc35e80e4f92388fa6ec81c8bb54319641897bdf0d45602
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://jottigo.ru/strik?utm_term=arihant+physics+class+12+chapter+wise+solution+pdf PDF link annotation
    • http://webcam-model.online/16569997611s2n3h.pdfIn PDF document text
    • http://requiredjokblog.com/nvs_6th_class_admission_formfqxb4.pdfIn PDF document text
    • http://giocodigital.website/call_of_duty_black_ops_2_iso_ppssppggc3g.pdfIn PDF document text
    • http://fijigud.22web.org/que_es_una_sentencia_interlocutoria_en_mexico.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/67df323ca.pdfIn PDF document text
    • http://filiwim.22web.org/4726004671.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/gomubigidorukefimunawasa.pdfIn PDF document text
    • https://dikasawo.weebly.com/uploads/1/3/5/3/135349802/2946492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupatugo.epizy.com/structured_cabling_download.pdfIn PDF document text
    • http://lonivone.rf.gd/simple_business_case_format_template.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_a7fb1fd2930e4e58abf0e45040f6efdd.pdf?index=trueIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_aa79c3f88e784e4d9667370a55a9df21.pdf?index=trueIn PDF document text
    • http://lupunajanap.epizy.com/acidosis_lactica_congenita.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_28f9100b36034d9dbe6274a1f2a6bc0c.pdf?index=trueIn PDF document text
    • http://kilobawul.rf.gd/29545050302.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_306074dfffd14e8fabc49d74ef78ad17.pdf?index=trueIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_0775b2bc8665443b8fe12b11647dc243.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_cc7cbbcdb27c48d9afc3815ffd17b63a.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 5608 bytes
SHA-256: 59ec849d6bc3cf5213570eebcc02c0adaec88641b77b2c310c9dd7571f22f44c
font_01_sfnt_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 10340 bytes
SHA-256: 1bec6ac0ab4261a1c8df4b34534105eb029f8b0b831c7e1a7ab61d35ade10d1e
font_02_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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