Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a5595a756388f7…

MALICIOUS

PDF

79.7 KB Created: 2021-05-19 13:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e7311c371cde7a32233c173159d02a76 SHA-1: 073eaa15ff150083fa2806bfb15a755aad4e39d6 SHA-256: 57a5595a756388f7f5595d28d9028b101305c25a3b21ca7c724a0e49f9ab28c0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The presence of a URL like 'https://resalured.ru/strik?utm_term=why+my+discord+bot+is+offline' indicates a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://resalured.ru/strik?utm_term=why+my+discord+bot+is+offline PDF link annotation
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/4227ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_606e0c95bd8a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fef9c6112145.pdfIn PDF document text
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/78e62.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/xonenevera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601b530d42973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5feeda0db1230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_600244b37c080.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/dogipesa-wapifebivan-wifawozuxek-fulepab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_606155363e766.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/2763207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_6011ca7f58359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd124e8-8c91-4c6b-b2b0-4a5de005d60e/fundamentos_de_marketing_digital_google_activate_respuestas_modulo_3.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/82870584003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5145efab-5908-49f7-8b0c-d5fa9e1e6e17/basic_math_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b630e9-434f-4ce4-acd9-9e4ffada1342/how_to_reset_a_rca_truflat_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574b6823-1490-4ba8-9b3b-c91f4c00122b/68464947221.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/monsters_vs_aliens_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ed50a1-b5ea-44f0-91fd-6179bfdda314/changing_states_of_matter_virtual_lab.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/77635921102.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/7580222548.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/brain_aneurysm_treatment_guidelines.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 5308 bytes
SHA-256: ecf72394db014852c5d0194b14d02be054d28404b76c4a20fe183781ded00518
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10900 bytes
SHA-256: 1307538d1703e37effc10af23dfbba5eb6e33fb35c21865f94a53b6b76380416