Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e121f318fd21a0…

MALICIOUS

PDF

75.8 KB Created: 2021-01-13 03:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 56c9adafafc789f8925f226107c60d7c SHA-1: 3741949e3041f36007fe52af6815774e2dc237ad SHA-256: f0e121f318fd21a005263cddd62e97cabb67fda46f4482c184688270f524daac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest an intent to lead users to a phishing or malware distribution site.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=cloud+games+apk+ios PDF link annotation
    • https://site-1168528.mozfiles.com/files/1168528/dungeons_and_dragons_cartoon_streaming.pdfIn PDF document text
    • https://site-1185570.mozfiles.com/files/1185570/aw_tozer_the_attributes_of_god.pdfIn PDF document text
    • https://site-1176527.mozfiles.com/files/1176527/commuter_train_boston_to_newburyport.pdfIn PDF document text
    • https://site-1172703.mozfiles.com/files/1172703/30321405334.pdfIn PDF document text
    • https://site-1174368.mozfiles.com/files/1174368/9719131526.pdfIn PDF document text
    • https://site-1218703.mozfiles.com/files/1218703/zusosetipana.pdfIn PDF document text
    • https://site-1180194.mozfiles.com/files/1180194/sowone.pdfIn PDF document text
    • https://site-1177243.mozfiles.com/files/1177243/34170165483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_5fbea4bcdaa0b.pdfIn PDF document text
    • https://site-1173201.mozfiles.com/files/1173201/forest_background_for_photo_editing.pdfIn PDF document text
    • https://site-1171394.mozfiles.com/files/1171394/77750343896.pdfIn PDF document text
    • https://site-1224368.mozfiles.com/files/1224368/17603344113.pdfIn PDF document text
    • https://site-1216774.mozfiles.com/files/1216774/20755474211.pdfIn PDF document text
    • https://site-1176998.mozfiles.com/files/1176998/fishing_diary_mod_apk_1__2__0.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/tuzakifezara/83709797198.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/72962287123.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5152 bytes
SHA-256: 11330c7b3e95b34b81c57b6495e5baac56fd390ed95f1a7d3f6651004b02aa1b
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10928 bytes
SHA-256: 126902216ae21ef5a52e14bbf79693bebb472c36165c4625bbd2fe5b69a462d0

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