Malicious PDF — malware analysis report

Static analysis result for SHA-256 c725272dfe993162…

MALICIOUS

PDF

77.6 KB Created: 2021-05-04 08:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1768af84eefa333684974711cf3c4ee SHA-1: 79542f5c886bcb0d773085c7a1accecae40e2ff9 SHA-256: c725272dfe99316222a0486452ab2091fa723d2435daf2db452533ae135b7548
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs and the nature of the heuristics point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=palsy+walsy+crossword
    • https://bokupotanija.weebly.com/uploads/1/3/5/9/135995636/9338015.pdf
    • http://dudosawiroti.22web.org/29347432360.pdf
    • http://xonigej.mypressonline.com/tutawabupi.pdf
    • http://beririka.scienceontheweb.net/five_reasons_why_the_renaissance_originated_in_italy.pdf
    • http://talajifit.mywebcommunity.org/tafsir_surah_al_waqiah.pdf
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/40cafdce6.pdf
    • https://dasufurejer.weebly.com/uploads/1/3/0/9/130969026/9241638.pdf
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/xuzomu-jirut.pdf
    • http://muvezada.iblogger.org/hannah_arendt_on_revolution.pdf
    • http://leririv.sportsontheweb.net/43721262023.pdf
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/bolefezevara_buzofolej_fokopufos_lojenix.pdf
    • https://denibemexe.weebly.com/uploads/1/3/4/5/134597338/c0ab2c6d3f.pdf
    • https://gawinageriju.weebly.com/uploads/1/3/0/8/130874076/lagarotetizipeva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_5c3d04102d1f4c0b9dd02ec5924781bd.pdf?index=true
    • https://s3.amazonaws.com/vanatul/52192059761.pdf
    • https://s3.amazonaws.com/teximikamukubo/desingu_raja_ammadi_ammadi_song_free.pdf
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_3981efc519ab4c94a34ad666522f25f5.pdf?index=true
    • http://leparitupoxow.onlinewebshop.net/59026581408.pdf
    • http://bumilamufitilu.epizy.com/65709086074.pdf
    • http://kepipejesa.epizy.com/9433757785.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92c.bin
80b900b6cefe7b68874bbc90e60d07dcf2bd0453dd58a0bda358c380502405c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 4564 bytes
font_01_sfnt_off0000f8b7.bin
089b95e95afc1ec19ff3a0d07ae593f98da7f0bb82b5b6117ab9d8492fc4bc99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 9876 bytes
font_02_sfnt_off00011a97.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 4324 bytes

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