Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc257679ebefe65…

MALICIOUS

PDF

74.7 KB Created: 2020-11-25 03:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 36f1ae253cd711dd10553605a0f73f6e SHA-1: 1f90dac519c9c56576a623a60354e0372ebf687a SHA-256: dfc257679ebefe65a84573813336b149722de0082b1a679fe5af286a3ab45380
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to disposable hosting services and at least one known malicious redirector. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=overhead+projector+sheets+printable In PDF document text
    • https://gozajajemitala.weebly.com/uploads/1/3/4/3/134325553/fakevu-pobasuxubipota-mekebow-kaputude.pdfIn PDF document text
    • https://nepuvaduwixoki.weebly.com/uploads/1/3/4/5/134525355/8ec508de41fb.pdfIn PDF document text
    • https://bemazinava.weebly.com/uploads/1/3/4/8/134890863/49502.pdfIn PDF document text
    • https://lumamiwaba.weebly.com/uploads/1/3/4/7/134735329/tanumekuxupezot_dosurako.pdfIn PDF document text
    • https://gorewexenedi.weebly.com/uploads/1/3/4/5/134585163/4d8f7377cd.pdfIn PDF document text
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/250be643454db0.pdfIn PDF document text
    • https://wobafedufuj.weebly.com/uploads/1/3/4/0/134012960/5938358.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/c95a3f3c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fa8bafab97dd.pdfIn PDF document text
    • https://padorapa.weebly.com/uploads/1/3/4/4/134496521/1432368.pdfIn PDF document text
    • https://tuxilumamiwuwuw.weebly.com/uploads/1/3/4/5/134582020/911775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fba73a016426.pdfIn PDF document text
    • https://metogenefino.weebly.com/uploads/1/3/4/6/134629585/7286750.pdfIn PDF document text
    • https://mixodozom.weebly.com/uploads/1/3/4/3/134333910/wewuroposow_gegozowikivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_5fb5b99686ca4.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/gugazireped_finijosuporetaj_pejezet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 5464 bytes
SHA-256: a9b3ff56d45c861f4c241aad7101351131a62269b953676821090b774512a253
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10188 bytes
SHA-256: 446a5a9c56c0825a6b11844c8b03fb89c6fbfbe4f45fa31ac074f97993ed4502