Malicious PDF — malware analysis report

Static analysis result for SHA-256 4776db6b4e03b8e0…

MALICIOUS

PDF

59.6 KB Created: 2020-11-23 16:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6a7b0bd009899772410f5fcad69b9f57 SHA-1: 7c8b2da77f07992541e3ee09dab1436266c5b108 SHA-256: 4776db6b4e03b8e04f8689e9b9f84d315356624c27f85daf0bb43d13a88dfab7
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The presence of a link to a known malicious redirector and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to academic writing materials, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/aws?utm_term=longman+academic+writing+series+3+pdf+free In PDF document text
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/1794539.pdfIn PDF document text
    • https://wokukome.weebly.com/uploads/1/3/1/6/131636951/zifitamegomesexu.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/kerasexox.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/dipaxefeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_5fa9140002dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5fa26d2adceca.pdfIn PDF document text
    • https://febefuso.weebly.com/uploads/1/3/4/3/134382796/lagalugebid-bolobulebuzo.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/fosalizuzu/avast_for_pc_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec38ab4-df7e-4ab6-9045-f299b3d0144a/xizisuwitopiliwodufukapat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1386cc-5d56-45cf-bd4d-7669655d747c/29143454897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162a8f13-1704-475b-ac67-3b3c8c9de624/carlill_v_carbolic_smoke_ball_judgme.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/14473508414.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_off0000abec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABEC 5640 bytes
SHA-256: 920973d2dd066fe28e1fb3c473f43ac1a390f24de0d9e6c68ab57c0886b0330d
font_01_sfnt_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 10188 bytes
SHA-256: 472144ae1c4520344c0be803f821e955dbde7ac2169234194c0c465c9f8411c9

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