Malicious PDF — malware analysis report

Static analysis result for SHA-256 4318db2c2d417203…

MALICIOUS

PDF

115.4 KB Created: 2020-11-24 08:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 550a99ad6091c1d7ad524b6f72d1e26c SHA-1: 164ca064b1fbf3dc0ed9a6e439183ccc277f3b5a SHA-256: 4318db2c2d417203b80357e42ee20efa61540d43f66f00c4cc47c639b3c12742
222 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to drive traffic to potentially malicious or SEO-manipulated sites, and the ClamAV detection further supports its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?utm_term=bee+movie+copypasta In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5f9e04b1aec5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fb4868004129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5f9eb77f4f21d.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/newegabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8f4954285d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_5fa4e1dfd8567.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/8b5b287c-ae46-46cb-ba81-d3ed59730a01/15137559563.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/animal_crossing_pocket_camp_happy_homeroom_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba050e5-3658-4c16-80f4-a0feab57d97f/ang_probinsyano_october_3_2017_in_roman_numerals.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/quickbooks_links_page.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/pegoremik.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/xivapafokumalod.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/27451813328.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/ruguvasevimurosoleduza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab34ef4-0fdf-4eed-8bce-762774fcdaf6/zerepov.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/connecting_arabic_letters_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B94 2940 bytes
SHA-256: 98626d7e946c09f9c239f2fa3d396c2da29ca55acac7f7566b4f25ec4811e40e
font_01_sfnt_off00017620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17620 5160 bytes
SHA-256: 44561b8fba994150d53ec7d737585855865907a88248a098ea097b500177acfa
font_02_sfnt_off000187ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187AD 10328 bytes
SHA-256: f7504abbbbad70e91cb0e12827c3d644b1f6724c34774370de3498951c5642ac
font_03_sfnt_off0001aada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AADA 16088 bytes
SHA-256: a31bcf556e181db077c9b64db679e746f1af4c47e86886feaa6b1c1c5ec82d40

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