Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafa684ae9df167c…

MALICIOUS

PDF

78.4 KB Created: 2021-05-13 06:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa3d9f9bdcf74759e59a53b7530e3679 SHA-1: 753de9364da109115f4e9dcf7661e6e93a8ac04e SHA-256: fafa684ae9df167c11db40176ef9f51931866181621e348f36139299194bb1e3
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of embedded links, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. One such redirector URL is https://crophysi.ru/strik?utm_term=data+analytics+software+examples.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://crophysi.ru/strik?utm_term=data+analytics+software+examples In PDF document text
    • https://cdn.sqhk.co/kajipazuto/eheicjd/85455100572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_60519218a2190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_6056b6dd91c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5fd84d2fec2f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_6062511aba84a.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/iejgZsj/galaxy_sky_shooting_mod_apk_2._4._4.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/ZwABLNO/pinituke.pdfIn PDF document text
    • https://zofizefeva.weebly.com/uploads/1/3/1/6/131636954/digikozokatuxozu.pdfIn PDF document text
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/bafiveruseseb.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/3304667.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/ginetavogoveki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_600cfba3b86b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_ec745bf2fda945ac879f46ecbd5454b1.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_a0b92d939aa64df0b06e43fcc8d99c79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65f7b40-1af0-439c-aac5-203c997fc0d0/76344864323.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/chuchu_tv_nursery_rhymes_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a844866-c8ab-434f-9fe7-e720a5e973e6/63583090395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0eaa88-026b-49f1-93c6-502bf263ea4e/car_air_con_service_price.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/percy_jackson_book_1_word_count.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/fazuwubudabuxofi.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/debilikolupa.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_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 5420 bytes
SHA-256: c8e304a4721fabb176b2b66213e8d462c6177aa69c94e6be82c53fd7bdb4bd18
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10588 bytes
SHA-256: b6fd48dcd77c06a290c29ad86e4a377449e03fcbc4af3527612c82ba15e06089