Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f30e527cf9168f…

MALICIOUS

PDF

67.2 KB Created: 2021-02-15 04:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1961427ff6f5f2e23e7ae82271023f6b SHA-1: 5c28c73e9672dbcf2e135efd7a4d6ff29a0e553a SHA-256: b5f30e527cf9168f6ef56f4b4b17019f97de3f5bc7b04facdb48b4694c7d827c
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, indicating it functions as a link farm. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of numerous external links suggests a potential for phishing or SEO manipulation.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/wix?keyword=4th+and+goal+2019 PDF link annotation
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/9025872.pdfIn PDF document text
    • http://it50save.info/dozipuxisetotupapagu5v308.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/1820203.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/6163596.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/8868226.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/6351734430.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/5736745.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/33453399579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fc6bf2b387aa.pdfIn PDF document text
    • http://vizezokope.iblogger.org/horizontal_recyclerview_android_github.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5ff21d77e5731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vikoxip.rf.gd/vubowokanufujema.pdfIn PDF document text
    • http://nebopepebog.rf.gd/xunit.pdfIn PDF document text
    • http://rowebilit.epizy.com/abordagem_burocratica_da_administrao.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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 5288 bytes
SHA-256: 973146a1acf98be3aefca60560e4ff0c52d28324cb7e069b7f062ef6c8e7e9f5
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 10096 bytes
SHA-256: 3dd45b6a18212a8e3d1e1ea74197b152dcfe46923068504892e7e8cdf252b4aa

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