Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a697c5cf67d172…

MALICIOUS

PDF

70.4 KB Created: 2020-12-20 11:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a86e36095a4fcff68663a0596ce55aba SHA-1: 6eb3150d97335de94ac811b449036b4014694599 SHA-256: c8a697c5cf67d17220e01031876301c53611cce5535b2e22bd09d941c7aeb863
254 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a link farm, indicating a high likelihood of malicious intent. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to search terms that could be used to disguise malicious links. The presence of numerous embedded URLs, with at least one pointing to known malicious infrastructure, suggests the document is designed to redirect users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cctraff.ru/aws?utm_term=malayalam+movie++utorrent+kickass In PDF document text
    • https://zaxavafu.weebly.com/uploads/1/3/4/3/134323176/bopikerenizaxa.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/c125ab7d2.pdfIn PDF document text
    • https://vajoribenokajug.weebly.com/uploads/1/3/4/7/134713142/4953001.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/pafijixinimov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5fa1617f6734d.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/0ca497.pdfIn PDF document text
    • https://xabuladuj.weebly.com/uploads/1/3/4/6/134677331/nudazuxitufawu-jedul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37965620-1777-4815-83b0-da7309b9882d/witoxemojorojo.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/swiftkey_keyboard_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/punurabogotaditibefifi.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/ipcc_report_2018_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/basis_points_format_in_excel.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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 3616 bytes
SHA-256: 11ef8fd0bd6fb727c3c26976059795c58d5dfc2d54c77e7eb1beedb686d571d5
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 5176 bytes
SHA-256: fea7ad5a25b8b07be7580a4685fb02eba2ffbb7ed6f0a6fc760543860416d744
font_02_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 13536 bytes
SHA-256: 3f0378ae982129099d7ce94692422e7d36bf315d2f42cc7c297b604e2c0bbbe4

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