Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd74bf611c4f0df…

MALICIOUS

PDF

78.6 KB Created: 2021-05-12 06:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c6a6f316b089cc8c8ccc319803c9d74b SHA-1: a531892d1a3ea06117634a67fda045fa4bad84bb SHA-256: 6dd74bf611c4f0df1f64576d28d40fe921ecce64adfb6c577becf1a051ede605
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive link farm points to a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=formula+para+convertir+mm+a+pulgadas+en+excel In PDF document text
    • https://cdn.sqhk.co/divojimo/eBidihx/btv_apk_mod.pdfIn PDF document text
    • http://copyrighytsupport.com/jaxefudupodubapawavobolp84og.pdfIn PDF document text
    • https://nabivuzofew.weebly.com/uploads/1/3/6/0/136050188/fikunuwilirinulefuz.pdfIn PDF document text
    • https://zawoxabupuw.weebly.com/uploads/1/3/5/9/135990747/640adf170997208.pdfIn PDF document text
    • https://nazemetov.weebly.com/uploads/1/3/3/9/133997276/pibudo-vesofekitoxurax-danoji-guvitevuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_605f8bb85f97d.pdfIn PDF document text
    • http://yesnutural.space/60499408818g2uon.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/dtheBAk/wupupi.pdfIn PDF document text
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/boduwiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd637eeda912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6012356a67b78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5fefd7a24b497.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/98f6de.pdfIn PDF document text
    • http://adanakebap.org/49291848914kiffr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff8f281e4a75.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/gek5fug/25988396199.pdfIn PDF document text
    • http://thecabinets.xyz/73921986825vd0pr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_2a2f92c09cdf4710be1a00dcc19df124.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_8ee1dda2d6df42f981e6bb76fb8e4fa4.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 5476 bytes
SHA-256: 5f04b71ada0b1f9f7636f42a47df7fc94626ffef4a50df91fe5fe17e9ddbc391
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 11172 bytes
SHA-256: f55bfcbaea12fb7ae616b5faa33242ef909b14d94ea7ca32c1bfecb02f057f14
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16088 bytes
SHA-256: 7ccd8150e2c48a9748994740f2a0713563e2bc66516285f786c138bc0577823a