Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5790c544450ed4…

MALICIOUS

PDF

103.2 KB Created: 2021-03-29 21:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 009d5697c07f87a7fa4536ec6ffbb691 SHA-1: 70991fe38d6dbc200a1081461f5ce22d2aa49174 SHA-256: 3f5790c544450ed47971327a660c82b97c48ea7cc8aa996c8766046ac371814a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=rudram+chamakam+tamil+lyrics+pdf PDF link annotation
    • http://fodamibokaf.66ghz.com/ansible_template_if_variable_contains.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/why_is_my_ac_not_cooling_enough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_6025e129087ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426557/normal_5fef5610aa9af.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/gezepiwazagafuxe.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_21432b7751f9489e80b52ec49584acce.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_d9797694eeb5491186d65ebd8dbe2171.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/what_happens_at_the_end_of_the_book_after_we_collided.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_9bdab97dbdec4880b00a2c17df7a9063.pdf?index=trueIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_ca1ec745370a45dca8a69e57caac2355.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_3c98c82ac4b74c41b4ce9886cc686fb7.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_162ff857e64f47558343dbd5e9f382af.pdf?index=trueIn PDF document text
    • http://tumewadeb.epizy.com/61392686169.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_e91187edcb8445b0b8e2530b60c2afea.pdf?index=trueIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_f3e6e072f1434e94aeb39091924fea4a.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001348b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1348B 28244 bytes
SHA-256: 334d027f3a490bad0b37976c9c8b65af031658001c97804a77a094ba1afcdf26
font_00_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 5568 bytes
SHA-256: 288698e688244438ffb3b31fff0866a31c7b0e90587eef5ecbf68f17a745e3e5
font_02_sfnt_off00016bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD0 9788 bytes
SHA-256: b55175b37a16f5806f73835b344dc509abace076ae1ad1422d9dd405613bbe57

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