Malicious PDF — malware analysis report

Static analysis result for SHA-256 277848827f09da6c…

MALICIOUS

PDF

100.7 KB Created: 2021-02-21 13:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 67614d61c31e0575d3aa6abd5a9f1d57 SHA-1: 22caf7896edd7387b79def552deb1612340ba85d SHA-256: 277848827f09da6c976ba97dcc0a1842d228dee11c27dfa790b6408de996fa92
192 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 for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to running a Twitter competition. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan. The primary IOC is the redirector URL, which likely leads to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+to+run+a+twitter+competition In PDF document text
    • https://cdn.sqhk.co/derepinejabi/OqErjdL/90666374622.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/ehahggg/xumubalixoz.pdfIn PDF document text
    • http://servicesforsupport.com/161382650138wql9.pdfIn PDF document text
    • http://fullpisetc.ru/actividad_integradora_modulo_4_semana_26klvp.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/aVii60b/womuwuwasutunonij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408997/normal_5ff92d712e9fe.pdfIn PDF document text
    • http://kneeksi.ru/bomifepgtor.pdfIn PDF document text
    • https://cdn.sqhk.co/gozajare/dVhjhcr/mufos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_6023e9606e2ac.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/dutimajizowa/xotuse.pdfIn PDF document text
    • http://vubefezit.rf.gd/18440176145.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/14652685357.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/urine_culture_report_sterile_means.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/juego_de_ayuwoki_apk.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 4924 bytes
SHA-256: 12e6e6a70f71861763a5fd4ceee03c39863c8d7aae2b2fcee130a6812db05b4b
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 21324 bytes
SHA-256: 435c5a932bad1ac3f303f597cde7d59165d6fcd19fdc2df3b798c1b43569c9ba
font_03_sfnt_off000143d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D3 11900 bytes
SHA-256: fd150383caa008ff867de60ef036e84d01bc003fcd90dfce3ca722adc91527a8
font_04_sfnt_off00016c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C73 17000 bytes
SHA-256: d4ac819637898aad9dc1579ead02bd248fc25e529e822b7bf5b392112fe20f5c

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