Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7a9eee6c03b484…

MALICIOUS

PDF

77.0 KB Created: 2021-05-28 21:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 66c7b488635f5e33acf769928f6f6580 SHA-1: 035ed7f55839d9431b734bffabd44c7fd51dccc1 SHA-256: eb7a9eee6c03b484b0f903756d992313f5a6fb47b0207d859271e3d128820ed9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://jottigo.ru/123?utm_term=valence+electrons+and+ions+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443362/normal_600eef6032722.pdfIn PDF document text
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/a3cfb9ce63ecde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_6004f4d6f0ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_60324f37aa600.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/gifenanifivan_rarozatodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_600555c3bf06a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5feb0925f0748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60616b23a4558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_6024653988217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5feb176fd802e.pdfIn PDF document text
    • https://xikixofifot.weebly.com/uploads/1/3/4/5/134597691/davirazutafoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_603e7a48ec4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_600ddf75af251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_5fd735e9d72f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fe8827226a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_5fda89ece7bb4.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/dirusivesuwa.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/e9f164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec64c559-966b-44d9-b623-231a51383e17/what_are_examples_of_universal_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4cad94a-fbe6-4239-8bcc-d3d4a20da67b/zobawigitojabujaxojib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182c56ee-cb6f-4fb7-9b08-eeccdd4e5567/plantronics_backbeat_pro_5100_hard_reset.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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 5364 bytes
SHA-256: 3748e5073105e4a5b97c9ffb5f0b2e87ed0a72f18f3b0cdfc0f7ea4baf03c231
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10828 bytes
SHA-256: 315b751e12143a898b1f46d3decb44b7a9f2ad83e868556b01f84dd2d5e4faf9