Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0298a42ea668798…

MALICIOUS

PDF

85.0 KB Created: 2021-02-17 00:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d3a27544891acbc95db2336a19a59ee6 SHA-1: dd7f90a7abf2b78cc06f2ed721b87ab19ca97cf1 SHA-256: d0298a42ea668798e7cfeb498fb47606571f1e1b8ba31a52f34eff9fcc920352
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely involving the exploitation of PDF viewers or social engineering to redirect users to malicious sites.

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://crophysi.ru/strik?utm_term=how+to+be+a+successful+public+relations+officer In PDF document text
    • http://f13x.xyz/infinity_gauntlet_omnibus7f83y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_601dfa9369056.pdfIn PDF document text
    • http://rusakova.space/vipudibazawl9un8.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/loramunozavak.pdfIn PDF document text
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/4049173.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/434315.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/demobonezi.pdfIn PDF document text
    • http://slamelina.website/broiler_management_guideg0qrr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fd2ad21d93ee.pdfIn PDF document text
    • https://katexiru.weebly.com/uploads/1/3/4/5/134576370/ratovozobin-lulekuvefun-pefiru-nabipuwitarofod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_5fdbaa547cebc.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/fasugivujetito_redasulesagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_601718dce6472.pdfIn PDF document text
    • https://fuwosijeven.weebly.com/uploads/1/3/0/7/130738701/1605967.pdfIn PDF document text
    • http://itdiscounts.pro/4332990511tcw19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455207/normal_6007b854c4d7e.pdfIn PDF document text
    • http://7lessons.fun/91989357304c7k9h.pdfIn PDF document text
    • https://fimizugowukabi.weebly.com/uploads/1/3/1/1/131164572/vupigerijava_sexarixewokuneg_potikigabez.pdfIn PDF document text
    • https://gavurefeg.weebly.com/uploads/1/3/1/0/131070452/lutanik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 5084 bytes
SHA-256: c58562e70ad65f53664c1d27173f3055d46e417f70c84db739c7f991f4140a58
font_01_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10208 bytes
SHA-256: d63dacfcf23c7c12eaa0b3f8d69ffa54affce9a6193eae40653991f838b5dae0
font_02_sfnt_off0001382a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361