Malicious PDF — malware analysis report

Static analysis result for SHA-256 79520c937ef75ab1…

MALICIOUS

PDF

76.5 KB Created: 2021-04-01 01:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2d9a3b8e3d430ab28289526c8b5e242e SHA-1: b1a5b6ef428dd6ee65915a95e4f4fb694acdab8b SHA-256: 79520c937ef75ab119c1e14caf333261e99347ea3fd206187809a6f1a208123d
156 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 5

  • 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.
  • 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://crophysi.ru/123?utm_term=ff14+gardening+crossbreeding+guide PDF link annotation
    • http://rubyshup.space/how_to_mount_burris_eliminator_3vrtmt.pdfIn PDF document text
    • http://bitsracing.net/vivoketinafiwetakemso98.pdfIn PDF document text
    • http://twoup-viktoria.online/60502898494wfyuo.pdfIn PDF document text
    • http://gigezesuzobe.getenjoyment.net/50273891039.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/eff91989-a8cd-4f1c-a955-50945e6c4483/download_playboy_carti_album.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/zoxiwe.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_1d6914aaab2f4b4899901af55989a0bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/brother_hl-l2360dw_wont_connect_to_wifi.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_7a52230a27d84018968b903e4bcc3938.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_ba34a7de37404e7e993aa70a7d97da85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomakobez/bunovonutogexazufo.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_438df6fd3bfc470db74d9ba54d7f00d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/mosusemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b744da3-3818-42ff-837b-6589095d5783/jasevesavarekozes.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/50541772382.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/why_can_i_not_subscribe_with_twitch_prime.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/2019_amc_8_problems_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992f2734-27fd-43d8-8b25-5136349e2ab9/health_and_safety_rules_on_construction_site.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

Related samples 6

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5392 bytes
SHA-256: fc4953023748a039dd080f8d40815c16910bbc7497775e008703619f609af078
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 10776 bytes
SHA-256: 4da4e9933db4ae466f163ea59d2fcee9a55e637c8622a84fd0bf121deade03f8

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