Malicious PDF — malware analysis report

Static analysis result for SHA-256 b763cc5b4dd93a7a…

MALICIOUS

PDF

87.1 KB Created: 2021-03-24 17:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e18371003f85b38e9d9295ded812037f SHA-1: 49b85bef06fc373b5bf5e7a6232d3b3023065bad SHA-256: b763cc5b4dd93a7a0e0e1b7e71e7f9290e7b21977aa51f3653470acec274cd25
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically targeting users searching for 'antivirus avast gratis para android', suggesting a phishing or malware lure. The presence of multiple disposable domains and link farms further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xezojetit.ru/123?utm_term=antivirus+avast+gratis+para+android PDF link annotation
    • http://xemizawufogutuf.scienceontheweb.net/96342215868.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/pamazidabenelobamake.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/Fa8kjiM/nabikoweti.pdfIn PDF document text
    • http://zukilobuzoroko.66ghz.com/65721147048.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/phylum_chordata_notes.pdfIn PDF document text
    • http://detubogoxugovub.22web.org/mupurafujevulidunoli.pdfIn PDF document text
    • http://gefaveje.22web.org/discrete_uniform_distribution_expectation_and_variance.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/4371563783.pdfIn PDF document text
    • https://cdn.sqhk.co/sixajuzap/ihiagf7/food_wars_season_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nubalitedeb.epizy.com/dunesetepekeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2222126-9f0d-4c43-82fe-6d984c7a7c6e/glacier_bay_faucet_parts_breakdown.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_b677929645d94fe5a3f0359f92612e3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b435957-46d6-4488-98d7-5f72aa1dd4da/larar.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_c89a3a488eeb42d19f3d095bb709befc.pdf?index=trueIn PDF document text
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_b7bf761d951541259b97ee914ac15ac8.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_63d83fbefc52428388d0355c4959a5c0.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_3ecbae05c9d1477fbe0276ec54f535b3.pdf?index=trueIn PDF document text
    • http://wanudag.rf.gd/as_a_man_thinketh_chapter_summaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad6005f-ee11-463d-8fb9-84b24f2edf74/rurezifin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d49e77-a5f3-4792-9da2-1cdcfc829097/nojidi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 5144 bytes
SHA-256: 8b865adea59ffa2e0cc06e33403bdc51ac89a2bbe0a803de88aec0f096a0a405
font_01_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 12176 bytes
SHA-256: f2c282ef1ab482568de3a05c37123bdfdc43e8cfc921d57bf909593c6fec672d
font_02_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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