Malicious PDF — malware analysis report

Static analysis result for SHA-256 377fc75163ff585b…

MALICIOUS

PDF

67.9 KB Created: 2021-03-26 01:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa959d7647764edf92039884ec1c5d86 SHA-1: c59ff3a123efed68d590d6e48502a54d2f3bf5b3 SHA-256: 377fc75163ff585bbbde93262066b57eedbfc9c76a013937d5fe8350702ccdb9
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a phishing lure, specifically using SEO techniques to redirect users to download sites. The primary URL, https://pelibifir.ru/123?utm_term=uc+browser+apk+old, is identified as a redirector for a 'free-download phishing' scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to trick users into downloading malware, likely through a chained download initiated by the initial PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/123?utm_term=uc+browser+apk+old PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387573/normal_6048702f69595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5ff8d38f7d045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_6045f2ae8fd03.pdfIn PDF document text
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/6b4254fdc0f.pdfIn PDF document text
    • https://pomapufawupufus.weebly.com/uploads/1/3/5/3/135397804/6903f365af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_604dbe8564c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446917/normal_603ee568bec95.pdfIn PDF document text
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/1177012e4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasofulutix.rf.gd/10505257352.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/62331554145.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/sipamidofapelamasojalij.pdfIn PDF document text
    • http://warevaxuderisi.rf.gd/donifasobefikirodow.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/tatugawafesom.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/bazexalebuzaweroruwura.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/axl_movie_2018_in_tamil.pdfIn PDF document text
    • http://xifetofaramil.rf.gd/fufojexot.pdfIn PDF document text
    • http://fusatepalu.epizy.com/inspector_general_report_fbi.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/pejizuwijukogepelagokeko.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/a_peoples_history_of_the_united_states_chapter_21_summary.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_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 5356 bytes
SHA-256: 0c79d07256d85dd9320c4d0efa491e4b4262e5d2fa6cea243e7658488d75bb5a
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10356 bytes
SHA-256: 445f23a2bbf4c4f793ffb0269fff73c30e977ff7cd66d806bfa5e19ebbd42338

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