Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26ec3cb4c060622…

MALICIOUS

PDF

68.3 KB Created: 2020-11-22 19:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0733038013a3c704740da8f683b8eb8a SHA-1: e4ad35f39c2df6887fc51dd9fe866ae741b4eb41 SHA-256: b26ec3cb4c060622eee5dfb1cfcbc453ce22e0973aa6405c44fa9e75f8b1b94e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier and ClamAV also flagged the file as malicious, specifically as a phishing trojan. The presence of a link farm suggests an attempt to manipulate search engine results or redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ggtraff.ru/aws?utm_term=flipkart+bedsheet+double+bed+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f8b60e7cf445.pdfIn PDF document text
    • https://padavosasosak.weebly.com/uploads/1/3/4/6/134632247/xipatopox_vataberiruto.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/zanolo.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/mikegofatul.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3718456.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/sotejubido.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/lanubili/50387307668.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/dasovunimifivezus.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/free_bodice_pattern.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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 4980 bytes
SHA-256: 4d3307e68adf99692d110cf13eac52e45a06505293f63c01fdfc4acb0f28c77e
font_01_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 10348 bytes
SHA-256: 8b1e3186a02320dfa25c670aeeadc77384eb4e42b7c82e7e88d9458c663a7809
font_02_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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