Malicious PDF — malware analysis report

Static analysis result for SHA-256 de735a9e0d05647f…

MALICIOUS

PDF

81.1 KB Created: 2021-02-12 01:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1a469cb891e1bc2e747f8ed9f442b8f8 SHA-1: d1c1937bcdfc00ab598997c89ecb257b82445a4d SHA-256: de735a9e0d05647f8cd7aad98f74f52bb4804d037ce90eacdcc8245d95148672
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on disposable domains, indicating a link farm. One of these links is identified as a malicious redirector, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://yafferge.ru/123?utm_term=social+movements+of+the+20th+century In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_600f883cb1b08.pdfIn PDF document text
    • http://s7hmus.org/printable_piglet_ears_templateu4ny8.pdfIn PDF document text
    • http://secret-empire.ru/binary_addition_and_subtraction_examples81h1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fc9fb77c824d.pdfIn PDF document text
    • http://sapazukuwujoji.22web.org/temiresapapotifixinuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_602454fa35e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_5fd2adcad23c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384634/normal_5fcf655567265.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/ehh6Aii/95895723460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6009ea24a3ce9.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/7695036.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/7RAjhrc/gadefelawaz.pdfIn PDF document text
    • http://converstarget.ru/winulejajefelunadasosasanp7me1.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/hbH3hjI/9826077257.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/ejbjjcK/stickman_run_around_the_world.pdfIn PDF document text
    • http://risejesifisem.22web.org/buchholz_relay_is_used_on_which_transformer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_601b21ca59057.pdfIn PDF document text
    • https://mavakonagidesa.weebly.com/uploads/1/3/1/4/131483278/202c3efea3df79f.pdfIn PDF document text
    • http://worldhold.online/xuzasepokunezomivo0jht5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaramoturowuf.rf.gd/merit_english_to_amharic_dictionary.pdfIn PDF document text
    • http://xupikilagi.rf.gd/sitosatupupixuwisumova.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_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 5660 bytes
SHA-256: 98ec45ccc954867dc67357d8d91d6c5315c58b2dedcd5ef42472bb09a0df5b26
font_01_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 10348 bytes
SHA-256: 24e83b209cd139a47da942cb6fe3bdf46245423ee76d655cb9a400f9e837d16c

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