Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bd0a99b7e6a0a6…

MALICIOUS

PDF

81.6 KB Created: 2021-03-05 01:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4f6320f54449bd2f0b7a525a69468b6a SHA-1: 28dba3c5d6357eb199cbd40d2d64f6a4278ec70c SHA-256: 53bd0a99b7e6a0a6adf88987f3a52c969b3ff68ba8bc5e591e024dd23758feab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs and the ClamAV detection strongly indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/award?keyword=tp+link+smart+plug+wont+connect+to+alexa PDF link annotation
    • http://vashastrahovka24.ru/769746900938n68d.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/7dc9f10.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/davaz-supunalovigida.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/LOijdhc/8200159012.pdfIn PDF document text
    • http://bio-ita.fun/princess_3_old_bridge_road_nelsonxi8gf.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/fNoWbge/csdr_reporting_template.pdfIn PDF document text
    • https://cdn.sqhk.co/sivumazudi/hfHhhHB/23764631966.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/bazajibufomik.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/safoxokefaviri.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/geW3gij/minecraft_island_village_seed_1._15.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/8323c62a-234e-4371-aed7-14214e61bc7c/67120081234.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_6f2d30b90920440790e1036102e738b9.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_378c263f866f4f63b5aa43c80f9e0830.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_d5af55f3236841eebad7f1009137259f.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_a3aede39c7ce4c3ca2dc0760811d48cf.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_ff7e3782a289487a88d8f9fab354a263.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_83e22d4372854cc589256f79a7e42c7e.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_cdfa198d00414a28a685aaa5fea677c8.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_5f63fb98f4c9476898c13d6514316040.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f3fa53-5733-432b-ad45-207f048e54c7/28382503845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f338da-f2f9-4e60-89ee-d8526f7fd18e/are_electrolux_refrigerators_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ba95d6-778a-4baf-b5f0-7b39c14e659c/homers_iliad_short_summary.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_1b17e8d1405a41189cd7f0205472e1ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a2f838-6fde-4751-bae0-dc0f7a65ef60/skyworth_tv_55_inches_price.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 3796 bytes
SHA-256: 89ff1a7182bdc86a4744749867eabe9502b9919892bb09fa2de2fd546f420a2c
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 5424 bytes
SHA-256: e12a1232505369a99b63e72d4d0b77e508cc37fdee78f8a56b838a97e5e04e3f
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 10844 bytes
SHA-256: 8b8b23cedfc3da658f8d09f235ab09a609c1e69e4ef1039b0babeb1f76ab3374

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