Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e4b29e6e78c554…

MALICIOUS

PDF

65.9 KB Created: 2020-12-15 23:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bd1ccc5733daa27a0af9e36f3cde9e64 SHA-1: 421adbfcd40ac622b76570ea07058564b9760ed3 SHA-256: 51e4b29e6e78c5542870063bd42f3a078b10c7e817f96376f66736a25e61f1ef
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, further supporting a phishing or malware distribution vector.

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://cctraff.ru/123?utm_term=fire+and+ice+hosta In PDF document text
    • https://static.s123-cdn-static.com/uploads/4391047/normal_5fc902046df77.pdfIn PDF document text
    • https://rofibefis.weebly.com/uploads/1/3/4/1/134131293/bitenolasezene_rogomezepiketaf.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/23a0c7580a1aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc01ccfc14dfd36feed28e9/t/5fc10186f3de5e49b587fb4d/1606484359351/how_many_ounces_is_in_a_pint_of_liquor.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/fagevifuwexuzewa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2740a2757459be2c9b8/t/5fc566a92dd96f5918a33654/1606772394177/49170732146.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/indiana_license_plate_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/52988655589.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/vitawikisupuzepotip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7009802915d4a16f5ed62/t/5fcaafa0538ea9548d98565f/1607118752833/garden_warszawa_biala_podlaska.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/dixieland_jazz_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/28699376449.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f988e2fce462bc8c518c/t/5fc65574145a8629dc897170/1606833528029/icy_veins_shadow_priest_leveling.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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 4952 bytes
SHA-256: 69763a6887753326e0a4094d05da7f544925d392fe97f1c58cd2f9da600af130
font_01_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10604 bytes
SHA-256: e224a582c0e0cc8c20e12e53f406210c38bdd3f809947489aabe6c5c13aaf158

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