Malicious PDF — malware analysis report

Static analysis result for SHA-256 534c5398753e01af…

MALICIOUS

PDF

65.9 KB Created: 2020-11-11 20:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 35f8e9614bafe8960c27fe901c900ab6 SHA-1: 102c1eebb21420efdc7f839328eabefa81c3fda3 SHA-256: 534c5398753e01afdc814e77ef0639b4744dfeda86d9acd6113d588d39901aa9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though corrupted, suggests a lure related to 'overtime payment request'. The presence of numerous embedded links, many pointing to PDFs, indicates a link farm or redirection strategy to deliver malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=overtime+payment+request+letter+format In PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/dobovowakedo_lunikisupo.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/5099162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f884cc64df51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f9264912be6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_5f9fddbe5a9ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_5fa4c2afb4b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f8cf47d94f09.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://s3.amazonaws.com/wonoti/26341080714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8e7500-5603-4847-a2ea-236c70e0a910/legend_of_zelda_level_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/81808883835.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/93247618492.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/51048104872.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/50223098045.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/mass_sports_teams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f322b3e4-0301-41f8-9415-35529ef8680d/lusezuxofubepasolajug.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_off0000b9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FD 5244 bytes
SHA-256: 0a4d178bfa878230559b88b7904b782a378abd0aec50febe433c579467a4369f
font_01_sfnt_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 9620 bytes
SHA-256: 90dbd257fdb793e5693cd8173a796a4d1407a1b0428980fc07139501d7a9d4a1
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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