Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff18c4808e2ab34…

MALICIOUS

PDF

63.8 KB Created: 2020-11-24 17:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: df0e07c6bfc846be75b49908658dcb82 SHA-1: c903f391e3ef6e59bf128384d12398d1a7be1132 SHA-256: eff18c4808e2ab349d2787595d8a4e74059abb7884581f71b905699fb863f908
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'physical science chapter 9 review answers', indicating a lure to attract users seeking specific information. The primary malicious activity appears to be the distribution of malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?utm_term=physical+science+chapter+9+review+answers PDF link annotation
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/fa5333b56d.pdfIn PDF document text
    • https://xogosikeduvad.weebly.com/uploads/1/3/4/6/134669078/5211593e8c.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/d88689fab847.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://uploads.strikinglycdn.com/files/3e254df6-4b19-4994-87b0-6882d42e7b8c/14444525213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419cd79e-8ecd-4485-ad01-6dedb59f3882/pumapikewej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91039479-2f25-461c-b686-ce7da897474e/80076576774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc9db53-36ac-4338-b512-6a61bb217250/5438064478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e116db15-1eaa-4ca7-bde7-b0ef9c5de6aa/2008_honda_accord_ex_l_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c99a78-f86a-4bb0-ac73-bab5803861bd/39352350823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a6dc17-2f56-4e0c-832b-d336f7462435/42605177565.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 5112 bytes
SHA-256: 074857680d3b6120c7fc84000aa07d244b192da74b847617d4280b8db28b2ba3
font_01_sfnt_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 10052 bytes
SHA-256: 0474d952ef2af2a58f6a73f0d79dccbf515c5898b4bf6be53151e0862270df80
font_02_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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