Malicious PDF — malware analysis report

Static analysis result for SHA-256 815a957ae2f0d377…

MALICIOUS

PDF

66.5 KB Created: 2021-01-25 13:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 22bc5916cde67eaacd5bcb10bc1fff34 SHA-1: c425c78f2772b67e5634b04f5953325b530188c2 SHA-256: 815a957ae2f0d3770e80cf2961f5d0b2d40dea2b8464a06ed43a407d854bbce5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external URLs strongly suggest this is a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for users seeking free ebooks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=kathy+sierra+scjp+8+ebook+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5feb40c78af86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5fd08ad8c0921.pdfIn PDF document text
    • http://jobware.pro/gold_stack_rings_australiapwnb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_600419a102007.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/526299.pdfIn PDF document text
    • https://tamunalu.weebly.com/uploads/1/3/3/9/133999965/de7b88b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463009/normal_5ff07c9ad2790.pdfIn PDF document text
    • https://tugiwosigef.weebly.com/uploads/1/3/2/7/132740290/4848ba6.pdfIn PDF document text
    • http://potolkilife.ru/royal_farms_arena_seating_chart_jonas_brothers8d34d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fffcb9f2bc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_600dde9fc16a4.pdfIn PDF document text
    • http://xufunuduxatene.iblogger.org/debate_motions.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/xeminesexuzijowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dulizarunagisu.epizy.com/furuno_ecdis_cbt_test_answers.pdfIn PDF document text
    • http://vodipofasofuf.rf.gd/gigabyte_aorus_pro_wifi_b450_manual.pdfIn PDF document text
    • http://tujiritam.epizy.com/bazel_android_test.pdfIn PDF document text
    • http://titomozuluvexov.epizy.com/aumentare_volume_airpods_android.pdfIn PDF document text
    • http://xatabiraluxuded.rf.gd/babag.pdfIn PDF document text
    • http://sulosuduvemog.epizy.com/gukigudewetofosijape.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_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 5880 bytes
SHA-256: 07bcf95e797f1726eaa4865d01260852662d68f54270445b2ecee4b4c27c4c9e
font_01_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 10056 bytes
SHA-256: ee009b884bf42ad66658636922bc20fd5991acba785eca7a8bd5d201c9ca0ffb

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