Malicious PDF — malware analysis report

Static analysis result for SHA-256 024cf873ebfd680b…

MALICIOUS

PDF

71.0 KB Created: 2021-01-26 10:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e957fb6067ef148b4d8cc6f9d8f0a6b4 SHA-1: 307db2725cd7e59f5306663009baaaea46b3ee04 SHA-256: 024cf873ebfd680bae64829c99a5468a5340dce79fb59b7716b79fc011fe0edc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

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://trafffe.ru/aws?utm_term=androidscreencast+windows+7 PDF link annotation
    • http://vonowaz.iblogger.org/10810716937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5ff026af6722b.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/8900250.pdfIn PDF document text
    • https://puguguduzi.weebly.com/uploads/1/3/0/7/130739618/231f47.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/bemevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fcaeb8d78db1.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/b4f8f7402.pdfIn PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/2338241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_600fa65475b55.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/74366616548.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/3765615.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/8948751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_600c1711c5a07.pdfIn PDF document text
    • https://midumusifefo.weebly.com/uploads/1/3/5/4/135401272/wutop-nimovamaxo-sapurexetexem-nedoloxarolaxew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xojesenokok.epizy.com/best_cv_templates.pdfIn PDF document text
    • http://nenutufap.epizy.com/scheduled_caste_application_form.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/74421237365.pdfIn PDF document text
    • http://poposumezaxek.rf.gd/child_s_play_5_seed_of_chucky.pdfIn PDF document text
    • http://mugudupo.epizy.com/isopropyl_chloroformate_cas_no.pdfIn PDF document text
    • http://gujigaxofalolov.epizy.com/bsava_manual_of_reptiles_free.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 5060 bytes
SHA-256: 59529bca963ecfeed29624a7bd7b226d8ff756e8ff42e65cf5d21d61df2bd548
font_01_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 10776 bytes
SHA-256: 531124a14314e79944744b0a736d318b058328c0b5084e8d1f57098cd995a574