Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed390c78e2b7dae…

MALICIOUS

PDF

81.2 KB Created: 2021-06-07 22:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dc3b1ab4691ce70e6bc52364adfc92f5 SHA-1: 09ddf21aa932c6a168bc1061ce3bc2664c97c9d6 SHA-256: 7ed390c78e2b7dae04c386bfd4d9edcbce495b25039a8fb0fd8f5e5c9425e40f
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and ClamAV detected it as a phishing trojan. It contains a large number of embedded links, many pointing to redirectors and disposable hosting, indicating a likely phishing or spam campaign. The primary goal appears to be directing users to external malicious websites.

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 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/123?utm_term=offline+android+app+maker+for+pc In PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/4d2592d490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_604772247ef2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6041de649d605.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/sawexukubokiwu-porovakumid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503578/normal_6007a102a02ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_600bc93b7379a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_606c0ed952c82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497695/normal_6004a26708fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_603affb37118e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_60420a4f08727.pdfIn PDF document text
    • https://fozoxusesabe.weebly.com/uploads/1/3/4/7/134748975/6b668fa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449181/normal_5fe347c56e9e4.pdfIn PDF document text
    • https://kusudojisopev.weebly.com/uploads/1/3/4/7/134774064/9671685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377380/normal_5fc9440554b45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_5fe07f7d7eb42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_60036dae22577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_600fda1b714e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60493291cc571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_60bd7c5864e12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600c37d53f2df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_605596a860829.pdfIn PDF document text
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/dufugezimawi-vadefexevezufes-wadidixas-riruzutosus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvupumanut.pbworks.com/f/2018_mazda_cx-5_service_manual.pdfIn PDF document text
    • http://fagimox.pbworks.com/f/simple_compound_and_complex_sentences_ks2_video.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_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 5212 bytes
SHA-256: a0ca91b93d19ba99043872b32b41b026ef188eb9cacfd079657349ee2da87fe2
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 10792 bytes
SHA-256: 288c065c79d02715074218fe9451ecbc56bf926849bf8e29dc73c3aaa4c2dce9