Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1d319cda6e5f2c…

MALICIOUS

PDF

145.3 KB Created: 2021-02-24 22:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 70355a25a4d4c0a9dc2808a55b895c23 SHA-1: 2e37eabeb87e8b0958b143d3ca6f6173504f8dac SHA-256: fe1d319cda6e5f2c7a184d4f670734cac4b889aa7f3e36c54b79350966ff117a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and redirectors, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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/award?keyword=2013+subaru+impreza+wrx+engine+name In PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/790759300822d6.pdfIn PDF document text
    • http://card2card-perevod24.site/nelijovimovivan6tzxn.pdfIn PDF document text
    • http://mandarin-fruit.space/869704364415919h.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/hjgj4ji/83646140432.pdfIn PDF document text
    • http://womukob.iblogger.org/mizegazogonolujelovol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd667bd1e1cd.pdfIn PDF document text
    • http://universityru.fun/call_of_duty_black_ops_3_androidmnfkq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470677/normal_6030f4e1222e2.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/jahdgj1/domujimesa.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/pViaUfX/mifelawujijuj.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/jbhfUD8/gif_sundsvall_vs_malmo_ff_live_stream.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_602e77ddc2767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://lidumadinub.epizy.com/51500610335.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C175 3536 bytes
SHA-256: 30dbff9d734531fa8b6e9acc678e1fe131c4a867d74b626c178a9c8eb8aa7eb3
font_01_sfnt_off0001ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE1C 5852 bytes
SHA-256: d5fec8ba3ea855b38dc0497061d88295072353e1c9f9952c42440d5d162eb76c
font_02_sfnt_off0001e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E201 6944 bytes
SHA-256: 9ffb91ef2555d485fdfe666518b42ee689a5891fb4d1d64a8820f333fbf057ec
font_03_sfnt_off0001f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4AF 14328 bytes
SHA-256: 9dbb979b95c308e89e2ce7c7f685269928cd4d5d0c5d9815ed8258de7e106348
font_04_sfnt_off000221d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221D2 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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