Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb195d6cc1dda69…

MALICIOUS

PDF

95.5 KB Created: 2021-03-12 16:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d0b888d37524e909dc82a8dd9781a18 SHA-1: 926590ca2c6202082ef60097e5b0245b50937e47 SHA-256: 7bb195d6cc1dda69c5f1cd58ba748ac7ef91da4e4f1ae2c3edf7364b81a4697e
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 0.9973

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://druttle.ru/strik?utm_term=108+mudras+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384836/normal_6031b5d49b413.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/1386578.pdfIn PDF document text
    • http://astropsychology.site/ziwevadiky7v.pdfIn PDF document text
    • http://itravelimpressions.com/practical_clinical_biochemistry_by_varley_free_downloada58r7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_602199791893d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5feb5a1e19ff2.pdfIn PDF document text
    • http://ipai.online/moludaseb703vp.pdfIn PDF document text
    • https://lizulamuti.weebly.com/uploads/1/3/1/6/131607093/e18725bfde.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/rasawosajupixe.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/gixulonevu.pdfIn PDF document text
    • https://poxejoretojav.weebly.com/uploads/1/3/4/7/134740271/bipibemuwedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391599/normal_5ff583abbacbd.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/1785445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_6030e4ce5b6cd.pdfIn PDF document text
    • https://lapolepep.weebly.com/uploads/1/3/1/4/131406498/c8c900669cd20a.pdfIn PDF document text
    • https://jexisaguratoka.weebly.com/uploads/1/3/1/4/131409442/08bf36d9.pdfIn PDF document text
    • http://italdom.fun/tj_lubinsky_concerts_2019isoj5.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/fikugosotilikigawe.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://uploads.strikinglycdn.com/files/35fc7ee0-4652-4a44-b9cf-8583d61b7600/89578077586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce29ecf9-e3c0-4922-82c9-52c77835ed65/memefenitogujepapil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a2af61-f124-4188-be35-d44289d312e6/33305113160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e969f54f-6631-46ba-b3c9-6b3add06866b/lirun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2f9026-1e18-413b-8f84-2cc81cee6b2d/all_stargirl_characters_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38ac246-366a-4907-87e8-15215d4b3b02/madiwalesekagij.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn 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
stream_006_off00014d20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14D20 10048 bytes
SHA-256: 39deaa112d2e5e0a019a4503efeea47b9d48eb9a8f20463e018dee72ab62c178
font_00_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 5448 bytes
SHA-256: a044b816811677232e377f82a23c2da30ecd2290caa9cfc0e5d3f324d116bff5
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 3772 bytes
SHA-256: e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 11244 bytes
SHA-256: 7a878725d030bf3aa059809576a5ebac91f76beabde381cf2c358ffc18a517be
font_03_sfnt_off00013802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13802 16116 bytes
SHA-256: 89df35e561940ad63d4da15b81be06f7cbbfb11dabde4560487300c3aaf19d33

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