Malicious PDF — malware analysis report

Static analysis result for SHA-256 5794fb144cc4beef…

MALICIOUS

PDF

74.3 KB Created: 2021-01-10 08:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 654562860a9593012bd0cb0f8e52b2a5 SHA-1: 4ac7ebecb62792187f36f77d822ae88d880feb4a SHA-256: 5794fb144cc4beef62503851e50391885946513a56a76880a3f8df99b3dee3f8
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to redirect users to harmful sites. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external malicious content.

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://traffmen.ru/aws?utm_term=caravana+da+coragem In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5f98acbab04a0.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/bekomukowajezud_jikusezamorokog_lajig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5ff9622a0b910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_5fbb04a1c1ccc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fc3f65d8255f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fbf1587bede5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe6b4c3df302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijumomub/63680369621.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/resident_evil_7_biohazard_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/adding_and_subtracting_fractions_answers_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/xesukiziwemenapitikedim.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/54981412522.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/father_stretch_my_hands_piano_sheet_music.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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 5016 bytes
SHA-256: daf5f7a8e0ade31cdcccd4866b76a4d11037df9e92fb58baf476a3638a4159f8
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 12436 bytes
SHA-256: 46746a41424f82234f05fbe551720c0e7a908ee4c53e9549ad481970270cd487

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