Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e92ff4d4d20f57c…

MALICIOUS

PDF

87.4 KB Created: 2021-01-12 13:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8f1be0e6c5259087e9011900c5498d13 SHA-1: 83f52f5dd404dfd71b409cd0842a89165a129326 SHA-256: 4e92ff4d4d20f57cdc78dd97b180406efd64c9d9b5af77c6e43b4c930a14cc72
252 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates that a link points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Classdojo for teachers', suggesting a lure to disguise the malicious intent. The presence of multiple PDF links and a redirector link strongly indicates a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/aws?utm_term=classdojo+for+teachers In PDF document text
    • https://mifojarodileg.weebly.com/uploads/1/3/4/7/134707921/jovevozenadi_metuke.pdfIn PDF document text
    • https://notokawuwo.weebly.com/uploads/1/3/4/8/134856920/ee4ac14bb.pdfIn PDF document text
    • https://cdn.sqhk.co/sivujazozis/R1ph1dL/rakesujewuzaguxivofoduti.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/sipofojexafud.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/14da3cbbd1142c.pdfIn PDF document text
    • https://site-1166752.mozfiles.com/files/1166752/23_1_specialized_tissues_in_plants.pdfIn PDF document text
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/tagemuriselitevuko.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/501638.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/e2e426bb4f.pdfIn PDF document text
    • https://site-1191130.mozfiles.com/files/1191130/favovoviwelugurosimoj.pdfIn PDF document text
    • https://site-1198654.mozfiles.com/files/1198654/manual_de_arduino_nano.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/zhcYjhB/72479164061.pdfIn PDF document text
    • https://site-1178961.mozfiles.com/files/1178961/motu_patlu_ke_cartoon_mp4.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/runuzitexokol/28705481337.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_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 5092 bytes
SHA-256: a12b178853861ada6c3e84f2edd0c9399856c266a172c687326ebf9fb4f50aa0
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 11440 bytes
SHA-256: 6e4e30962bcd9552ea28ea1f3dfda83447296b807845f97e6fb6b1ff3fc4fe50
font_02_sfnt_off00013a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 16384 bytes
SHA-256: f53b43e12006e3d52612f085e6e184fa5bba3604999f0cb64562e6bb996dc06b