Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4d5247391051a2…

MALICIOUS

PDF

68.4 KB Created: 2020-11-11 01:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 88c1fc99d20ec82fa5efc05ed9fa6e82 SHA-1: 12d4a6df6b2b7f23c5b7abae153759ee0d18e159 SHA-256: 1a4d5247391051a29ba36e19117e89e45943d3c826da647b43c19641b845a6c0
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to redirector infrastructure and a link farm. This strongly suggests an attempt to direct users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support the malicious nature of this document.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?keyword=grandma+flexington+story+raid+difficulty In PDF document text
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/felufedojos-vosamex-naxidekow-ridefokabewudox.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/63d8addbf5c776.pdfIn PDF document text
    • https://zeburunonuf.weebly.com/uploads/1/3/4/4/134458398/98a85ee5.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/5129771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5fa1eb39669ed.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/1471368f8aea1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zurovajij/quorum_ceiling_fans.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/30568908947.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/electric_discharge_lampholders.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/accounting_chapter_13_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/26006426486.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/ansi_denial_reason_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/biblia_reina_valera.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/the_hunger_games_summary_chapter_21.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/verizon_jetpack_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 5424 bytes
SHA-256: 2349a35053b871145913a71969e149c134a544816375c5bbc6a66e89ad4ea83b
font_01_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 10408 bytes
SHA-256: f280a6549ab822f38285fe91f54e286d5b538a5eebd2e44e384b57ad96ffd484
font_02_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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