Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac53d156bf14df8f…

MALICIOUS

PDF

78.0 KB Created: 2021-03-21 21:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 81c95ef3d7b6081f5e230ad335b41276 SHA-1: 9cf924aa12eecf05ba0380fa00ab410706d9a11c SHA-256: ac53d156bf14df8f61a204a16d0d57f69e28761aa5f6169e32afb409fee026d2
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous embedded URLs, many pointing to disposable domains, strongly indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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 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://crophysi.ru/123?utm_term=descendants+of+the+sun+versi+vietnam In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_601023d425258.pdfIn PDF document text
    • https://cdn.sqhk.co/wotudasigeb/jggiCic/xaxiginuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_604f3fbf01a47.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/bYhiihD/logo_quiz_answers_level_60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_600ea33f62f15.pdfIn PDF document text
    • http://drenajkrasnodar.ru/95579004355fnxwy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5fccec43315de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60372dbb980b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_60220bbd09479.pdfIn PDF document text
    • http://znalomstvavip.site/reset_braava_380tbinx3.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/1040211506btz8l.pdfIn PDF document text
    • http://gulivopaduro.22web.org/68090610057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_60100f4e9e48c.pdfIn PDF document text
    • http://letgtma.bid/velofafofebejzp02p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_60449f4da52f7.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
    • http://monulaw.epizy.com/xebesazazo.pdfIn PDF document text
    • http://bunigerada.rf.gd/apa_assignment_format_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/91895431424.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/diwibifepaset.pdfIn PDF document text
    • http://kametazita.rf.gd/jaxaxovinivawe.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/6332368186.pdfIn PDF document text
    • http://kezuxitejapub.epizy.com/burp_suite_manual_spider.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/86306253142.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_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 5172 bytes
SHA-256: 2b3f9457c13af53d26c913f8b12e669904c6c079445bf455bf2395c9d23b5e1d
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10976 bytes
SHA-256: 8cd6c1b8bcd62e8180c2233b97f5e0c9f18f3cbb4912dc19468dbb7050a46cae
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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