Malicious PDF — malware analysis report

Static analysis result for SHA-256 a476e2a2a766314d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-10 15:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: deba2d07dc16dbee6846b5ac7dc58bb0 SHA-1: ecedf8ca82092e9362e1885eaa55ddeb5bf382be SHA-256: a476e2a2a766314d8362aaf9e5b9afbb5c80f42dc59eb4a95fd8e036eab1f767
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are identified as malicious redirectors or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/123?utm_term=rome+vatican+guided+tour In PDF document text
    • https://zodixezujiz.weebly.com/uploads/1/3/5/3/135345824/9ded1d522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_6039028ad2c1b.pdfIn PDF document text
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/pamilukoj_rasilamajusesum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_603568c19b00a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409250/normal_6006600a533de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416918/normal_5fdf0dfe750a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_60352af1f291c.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/xizakoz_gosijikozifob.pdfIn PDF document text
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/1ed22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_602e59fd97ac6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477167/normal_5fcdbb2fd8f72.pdfIn PDF document text
    • https://bubinaxe.weebly.com/uploads/1/3/2/6/132681619/bb0397f79af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426418/normal_6006395f22cd4.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/4292915.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/dazovosugev/sitebogoz.pdfIn PDF document text
    • http://xujogefup.rf.gd/8940027461.pdfIn PDF document text
    • http://kenuzuwemonuda.epizy.com/best_affiliate_site_template.pdfIn PDF document text
    • http://jutivowewinuled.epizy.com/99961985104.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/uncial_antiqua_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/finite_element_method_book_by_j_n_reddy.pdfIn PDF document text
    • http://posewabenuxinot.epizy.com/lee_sin_guide_s9.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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 5116 bytes
SHA-256: 44cbbcaf58611faee6dbce2dbb3e7d265124e49e0e8ff4a61d5a60e73f39e481
font_01_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 10912 bytes
SHA-256: 6131e52caa302acea60681a48004a61059ea9b8a8f7906917b0539f4ebdc4349

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