Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49d4a3bfcea7c02…

MALICIOUS

PDF

80.5 KB Created: 2021-01-24 01:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 298cdf8c2c8e0de253ebf8f94f02853a SHA-1: d8798d33beb99c6364a7d3b34e7dd48213fa6ba9 SHA-256: d49d4a3bfcea7c027afb32ccfc1bcd8dfb329a4a592d6c36178d2bbdca5e4377
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. The document contains a large number of embedded external links, with the primary suspicious URL being https://leonvi.ru/123?utm_term=hummingbird+sightings+in+ct+2019. While no scripts were extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious or deceptive content, aligning with a phishing or spam campaign.

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://leonvi.ru/123?utm_term=hummingbird+sightings+in+ct+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc5e804e2281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369493/normal_600412da3ed21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5fda7a3c42e7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5ffabf17c5ec3.pdfIn PDF document text
    • https://site-1174856.mozfiles.com/files/1174856/40300432991.pdfIn PDF document text
    • https://site-1176701.mozfiles.com/files/1176701/maxipepinitusoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5ffccf76198d0.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/2270352.pdfIn PDF document text
    • https://site-1179802.mozfiles.com/files/1179802/space_invaders_atari.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/5e4c81c301a50.pdfIn PDF document text
    • https://jazazigiw.weebly.com/uploads/1/3/1/3/131398077/6904070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_60077b224f6b1.pdfIn PDF document text
    • https://site-1176369.mozfiles.com/files/1176369/60873597533.pdfIn PDF document text
    • https://site-1228635.mozfiles.com/files/1228635/11154810134.pdfIn PDF document text
    • https://site-1172568.mozfiles.com/files/1172568/how_to_get_lemonade_cat_in_tower_heroes.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/fivebo/wevomososif.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5696 bytes
SHA-256: 410eac586b47d9527edf9732187eba3303630bc48a6703707a0b2b065c2abbab
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 10876 bytes
SHA-256: 34c49886498e857351332687b496dd680f73eaaab717d8235bc8d83321a582b6
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16356 bytes
SHA-256: 20aa54a76171967c95a01118eab9c4df723f608536b9256e132745479fd7b3cd

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