Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f5e616a1336a4b…

MALICIOUS

PDF

63.0 KB Created: 2021-02-21 10:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 46e7db18aa9a736d3ead4241e6cf271b SHA-1: b9711a15c28d41b28671ac2a5db9df0bf97c6a69 SHA-256: 18f5e616a1336a4b377bef34e942c48b0d18eaf6de05989f9596feff851dc7f7
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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://crophysi.ru/strik?utm_term=connect+jabra+step+wireless+headset In PDF document text
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/jinopas_tifososafufa_zagovogexidat_karetum.pdfIn PDF document text
    • http://narelavupes.22web.org/86257840440.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/bnbQ3ge/world_of_kings_best_talent_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/mqhd6KH/45159876164.pdfIn PDF document text
    • http://selafakokag.22web.org/75392169421.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/gastroparesis_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzotulerijenej.rf.gd/bvnpt_live_scan_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/urdu_taqreer_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/4122466268.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/zutejesajefatamosuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/agathiyar_siddhar_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/69657138569.pdfIn PDF document text
    • http://keluwuvofaj.epizy.com/formal_resignation_letter_sample_short_notice.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_off0000baea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEA 5376 bytes
SHA-256: ed64cea9af8e99668626a00d3a5437c8de03c51c3d7fe93a6b6b0f2c52854823
font_01_sfnt_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 9940 bytes
SHA-256: 652c03d29c9e22a2f9d9f9faa180b3737037d6e0abb5d63f2531456b48cb477a

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