Malicious PDF — malware analysis report

Static analysis result for SHA-256 861161aca0b030ee…

MALICIOUS

PDF

74.7 KB Created: 2021-02-22 00:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d6dd21d94950058f94f6c7639c007d4c SHA-1: c7939ec64bb7709cbb67c1d75dae8d6395966de6 SHA-256: 861161aca0b030eefc695a8c40c6b1741f60aeb1a4bc8906cf2dce972c1f2c05
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'Precalculus textbook pearson' and 'wkhtmltopdf', likely serving as a lure to attract victims.

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/aws?utm_term=precalculus+textbook+pearson PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450636/normal_600f349423cea.pdfIn PDF document text
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/puxedegefif-tusanagukef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447447/normal_600009e23782c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443362/normal_5fe4d38c4f109.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/tosute.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/pejanuzowaburivu.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/ninotolok.pdfIn PDF document text
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/tizarotovesepediwol.pdfIn PDF document text
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/810e33dd7.pdfIn PDF document text
    • https://somakala.weebly.com/uploads/1/3/1/4/131409557/07dcf4.pdfIn PDF document text
    • https://zosixilerav.weebly.com/uploads/1/3/1/8/131856356/tugotap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5ffdd7ab5dbd3.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/f6803d4321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/10337962903.pdfIn PDF document text
    • http://vaterojot.epizy.com/khiladi_bengali_movie_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/95514731589.pdfIn PDF document text
    • http://weweladegop.rf.gd/rokuguli.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/nuzodolotusevuvonikaxuna.pdfIn PDF document text
    • http://gurunetotej.rf.gd/jexavokirovodofe.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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 5200 bytes
SHA-256: 306cc2d8a6c2a11438600b106a76619685c28b6343470250461e905eccce31b8
font_01_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 11028 bytes
SHA-256: 3d35d36977e9dc0f4e37c8f4cce805eada1d6dc1826c5367cf9211ba6d9c7e23

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