Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fec3580d12c18c…

MALICIOUS

PDF

119.8 KB Created: 2021-01-10 12:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8a0b1572a7882d9f94c686458d902f91 SHA-1: e94e4837acfb2f3faed39311644bd7c1f56659c3 SHA-256: 38fec3580d12c18c5cc1a821510350bbdd2f3285bdb7aeee00feb56dbbbc1f65
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external PDF links suggests a link farm designed to obscure the ultimate destination or to generate traffic.

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://ggtraff.ru/123?utm_term=davis+tree+farm+edmeston+ny In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fd8fe51cedba.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/beer_pong_championship_belt_shirt.pdfIn PDF document text
    • https://site-1200376.mozfiles.com/files/1200376/pearl_s_peril_hidden_object_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5f9187fa2255c.pdfIn PDF document text
    • https://site-1180826.mozfiles.com/files/1180826/bubble_bird_rescue_3_download.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/rubogofulupad_jalebewa_puwutuf.pdfIn PDF document text
    • https://site-1176181.mozfiles.com/files/1176181/revir.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/jozetej/ppt_puzzle_pieces_template.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/asterix_e_obelix_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/91742873611.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/99698262130.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/riwoxasuwidekapadited.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/71536709210.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/23262736951.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/luzawarodazuvusim.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_off00018b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B3F 5184 bytes
SHA-256: 9204c61b115c269d113bf3cdce3bfaa08c54d80d6f51b4331c745f7d1c822967
font_01_sfnt_off00019cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CDF 17420 bytes
SHA-256: 8612390d89ab2b7559d957cf98b504b39c8e2b422fea7d9ada066b30a4a7b786

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