Malicious PDF — malware analysis report

Static analysis result for SHA-256 7380238f2e0be585…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 02:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 50ce28f238fb613b23b013eb072bfff7 SHA-1: 4ccafefaf2eafd5430208443cd61c6f9213835df SHA-256: 7380238f2e0be5859419ee025ed2716735254269e979c0a4fcd4357f4c52bae2
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, indicating it likely serves as a phishing or spam distribution mechanism. It contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. One critical heuristic specifically flagged a link to known malicious redirector infrastructure.

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://dafemum.ru/wix?keyword=chemistry+unit+study+guide+answers In PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/c68dd2c6.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/6913673.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/7717247.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/9e48f.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/35668886618.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/fomugifuxeda_poroxejubofo_nefow.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/9738348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_5fd9706dc3aac.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/27505822441.pdfIn PDF document text
    • https://tifalexax.weebly.com/uploads/1/3/4/4/134471923/damatule_zakezajejodi_likezesetuvut_rugaravoril.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/calculo_integral_impropia.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/satit.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/wigaxasukajez.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/82117a9533d8bb5.pdfIn PDF document text
    • https://dekukosozo.weebly.com/uploads/1/3/1/0/131070054/sutukegotejitowamub.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/be69b2.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/8103611.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://bumunosusub.epizy.com/zagimadokivufejodoxel.pdfIn PDF document text
    • http://gusosowir.rf.gd/38774207921.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5196 bytes
SHA-256: cd29bc36470eaff57bba2d1dbc8884743f7a04093af9a54181019c716b25d4c1
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10544 bytes
SHA-256: 2dde025a9cc7513d7d35912bbbbf8d9e1260b45a8f57693792e48b6add1fa5c8
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176