Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83f1a3cd7a93d45…

MALICIOUS

PDF

77.3 KB Created: 2021-01-09 06:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2f40859ea111afbb92e0f6074dc7d8eb SHA-1: 9683bf9c0a6cbd24c21ec9a3a3c8b0c7d2777c2a SHA-256: a83f1a3cd7a93d4533987be153aa78ed25c9b93f962eb5e49c6af005379f0d89
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector services. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://traffking.ru/123?utm_term=chair+gym+reviews In PDF document text
    • https://rirakivu.weebly.com/uploads/1/3/5/3/135333056/najoxed-lavuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5fe4efb616ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f89088e682fc.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ggjihzM/77335498420.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/9562e6.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/chjehjS/6475731810.pdfIn PDF document text
    • https://xelixaxoso.weebly.com/uploads/1/3/1/4/131407481/c4eacb64f1d.pdfIn PDF document text
    • https://numetigovav.weebly.com/uploads/1/3/1/6/131606493/gelixejasu_fitokivobejoza_soxujaritin_penatobegenifib.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/P5iergf/26841997182.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/319b8.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/8719971d-0695-4d32-998c-f6b58fb529f1/10581210623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3e9519-30d6-4a83-9ce6-3180c99520a4/dutchtown_high_school_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b0a606-2f14-4546-afef-d90a229ae49c/transylvania_6_5000_trailer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 2968 bytes
SHA-256: 771033003054101e9e87eceebec65dd17fac76109d4f476580acb9549e794e17
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 5228 bytes
SHA-256: 2a26449fc02cf6d61a29b843fad08083a5eee7bee94b0f688561da61bb173ab2
font_02_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 10432 bytes
SHA-256: fd3b2bd9cdbb22e45a7a9a0bdc7d2c92242abfa2dfbeca1de1c9564d9d4abb28

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