Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13ab4fb31990419…

MALICIOUS

PDF

112.7 KB Created: 2020-12-31 19:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a66f8022576a98b9381638db7dbb1641 SHA-1: eb61be0bd992b6f140d32977208d37de934837d6 SHA-256: a13ab4fb3199041985f9b219cfe4d71cd292799a172ca3a5a4fd7abb236abe5c
222 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link pointing to 'traffmen.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flags this PDF, and ClamAV detects it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/strik?utm_term=angry+birds+transformers+wikia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5f95952986a5b.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdfIn PDF document text
    • https://zotizoju.weebly.com/uploads/1/3/5/3/135349435/nuzoso.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/e12e59a7-e8f8-4e7f-866e-7926a8b637cf/soft_drinks_that_start_with_k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab70de8-2930-4a15-8a9c-fdc9daf738d8/free_coin_master_spin_hunters_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1372236b-d836-4e7a-ad7a-88920512ffd8/nitiwipugevebibixiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9a91fa-4ad6-4033-891d-1770f3585da4/the_kane_chronicles_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b66576e-9b55-4fb8-9ce1-45fe52533eb4/87578174510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733c91ef-7839-43b7-b84c-8fd7ce8f41c1/95638694794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d401acf-5528-4818-8f0f-4cae96bd8101/fowitevaruwanobetof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863a9fae-d8c9-426e-96be-36a5646b0374/bakiweroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cccc332-ad30-4bb4-b2b8-09e2e7dbffad/edm_die_sinker_machine_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0ade6f-f15b-4e50-b28f-0ce47d865053/gumofubafesunubaziteladax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d20fd9d-4a81-4fd0-b5f6-fd9ce4f923ab/composite_to_vga_adapter.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_off00016c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C82 3288 bytes
SHA-256: 71df6b01bd31982b5a8eb93bc4e4624b4adb70dcf43762971e77e95a53f39c46
font_01_sfnt_off00017847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17847 5580 bytes
SHA-256: d20737b5efc84fa83a532dd788db68bed142f897ecf204d4d9d819a2addda338
font_02_sfnt_off00018b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B57 12808 bytes
SHA-256: 9cddab08969c833a569c779df2c922c0732750e38ea96a54b5d600ea0e6ed566

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