Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc91c4aab66f15e6…

MALICIOUS

PDF

102.1 KB Created: 2021-03-03 14:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d4367556cc85ce6c6718d71f2455a5b SHA-1: dce036b350144cf573ef13c6ac9a21a89afe554f SHA-256: fc91c4aab66f15e65e7f456bd86943d980532e85d68f6201be087c26dc7d7c7e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/award?keyword=charbroil+grill+burner+replacement PDF link annotation
    • http://kemytbok.xyz/nemidasemuwetagub886wp.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/598184649.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/xajovabuju-nobafolup-pamatil.pdfIn PDF document text
    • http://ketotreno.buzz/seth_strong_porn0k96y.pdfIn PDF document text
    • http://freds.space/puxopajikwy347.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/auWMpge/99141667773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446914/normal_5ff3edc5e086f.pdfIn PDF document text
    • https://rixajijinuroje.weebly.com/uploads/1/3/4/4/134473879/tususutexubi_lenow_baxanebog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_60381c0d9e2d9.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/kexasef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_601ae999088b7.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/8cb5b90d.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ZYcyiif/steve_jobs_last_apple_event.pdfIn PDF document text
    • https://zozizifubigidoz.weebly.com/uploads/1/3/1/4/131409074/jevumibuxabi-risiseb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5febf89514091.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/1227640.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/wuxupewu/69537949358.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/he_s_a_pirate_sheet_music_flute.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/augmented_reality_in_education_and_training.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/picsart_apk_mod_12._7._4.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_off00014308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14308 5216 bytes
SHA-256: 356ac1c1002778a2c5966df9ddc012697001c3b9312727f75631ed1b9c695ed0
font_01_sfnt_off0001549a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549A 17216 bytes
SHA-256: 37fd77277176ffb889516975ba80665c32c162021062b0e27d15550957ae5eea