Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c31935ac120c4d…

MALICIOUS

PDF

79.2 KB Created: 2021-05-31 12:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9005a6eec78998e2a200906c9ad30435 SHA-1: bf8470d317f27ca194f33fa3680b04984ddf0a19 SHA-256: 40c31935ac120c4d8535a308797306361ff743aafb68a0a76c0480f56a597dd6
214 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to potentially malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'dafemum.ru', indicating a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=siemens+iq300+dishwasher+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_6022d8af74d19.pdfIn PDF document text
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/203803c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_602c65b01f5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_6064bc2350235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_602507d59442a.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/6eb016bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_60636111c6537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_606d4028638e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6069d6279f904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_604b213784817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5ff91e6864bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_603c83ef343da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_5fd62c2420604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fedc57d43946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_605dae51ab446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_60449463da7ec.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/5160091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5fcf9faaadbf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fc809706e97d.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/08afb07d-9ac8-4b5a-989b-699b6367f650/9924845554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dceca842-b930-48e9-8d20-bbb98c61c05c/vamazesitenixidapij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553c18f9-f154-4946-aada-360a1ad9cd73/how_to_uninstall_deep_freeze_standard.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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5692 bytes
SHA-256: bbb9a6ad5553a6be45a68ddee76b1953a6e2c5716a2d50f9e18ad906cad6b979
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 10948 bytes
SHA-256: 7fad809130cba941b7e0463cc0c061b0aed9f424f6cdcc3620de9055aed931c3

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