Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa44e943d97a57f3…

MALICIOUS

PDF

110.4 KB Created: 2021-04-26 20:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ba9573ead5232ac03029c293d32413 SHA-1: d335f24290f6c2933cb98aa2c4aec27ea5e3bc1e SHA-256: fa44e943d97a57f3ca19a59f993604870bb83101393694933051e6b0a29bd8c6
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on file-sharing services. The document body, though heavily obfuscated, suggests a lure related to career opportunities. The presence of a PDF link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://zajinet.ru/strik?utm_term=how+to+get+a+career+position+at+usps
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/34b3e74530f1.pdf
    • https://cdn.sqhk.co/viwiratoposu/gp4jgdi/xuminugobigisufevomuxud.pdf
    • https://zanemuwezujapab.weebly.com/uploads/1/3/4/7/134765617/jasuza.pdf
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/gotibolikiw.pdf
    • https://cdn.sqhk.co/panafilaputu/gclF7gj/16558860393.pdf
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/1f59c77ed4.pdf
    • https://bobovisosusare.weebly.com/uploads/1/3/5/3/135394734/87528adb1989979.pdf
    • http://tanirexelobixo.iblogger.org/how_did_rebecca_die_daphne_du_maurier.pdf
    • http://gagafelame.22web.org/52307199032.pdf
    • https://cdn.sqhk.co/wedowetaso/jhggggi/96404485120.pdf
    • http://nanewak.iblogger.org/washington_state_patrol_accident_report_online.pdf
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/6520418.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lilufafuf.epizy.com/az_a4_form_2019.pdf
    • http://mutezojujamanu.rf.gd/peavey_vypyr_vip_1_manual.pdf
    • https://uploads.strikinglycdn.com/files/207a8001-5d1c-4030-aba7-68fb8914249c/97433994345.pdf
    • https://uploads.strikinglycdn.com/files/bbc9cccf-45c2-4c0f-bfcb-bb31d2141c40/what_is_a_veldt_definition.pdf
    • https://uploads.strikinglycdn.com/files/b23c8915-64d5-4361-9226-14593420249e/como_hacer_una_corona_de_adviento_2019.pdf
    • https://uploads.strikinglycdn.com/files/4ea9c054-baee-4100-8b21-52764566971d/what_is_the_latest_version_of_the_eagle_scout_workbook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000173cc.bin
564ec60b20360250e69300aad3c92a5c96b79073c898965f3520d09828d93ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173CC 5120 bytes
font_01_sfnt_off00018560.bin
beee3d3ac0188e1cf2296427f2fe51ec10ae17c1a90ad5993b5aa7ade00f83a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18560 11408 bytes

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