Malicious PDF — malware analysis report

Static analysis result for SHA-256 e497c43f5145d161…

MALICIOUS

PDF

75.5 KB Created: 2021-04-01 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 27821973386e0ef0007de761709df0c9 SHA-1: dffa263c3e32b1b6c29294b7abda4d87debd4d74 SHA-256: e497c43f5145d16182b5c6bc60ef4a19350b54a25257f3dcabfaeef8f30b0728
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with a high concentration on disposable hosting services, suggesting a link farm or phishing campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wix?keyword=dragon+city+eggs+hatching+time PDF link annotation
    • https://mijigudi.weebly.com/uploads/1/3/4/3/134352865/nunilufi.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/93873a.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/65a3de090a114.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/lefinuposi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_604b997024421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_605714e30fe00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_60635857679ea.pdfIn PDF document text
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/6993440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibujilapewe.epizy.com/50809742586.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/97472127096.pdfIn PDF document text
    • http://pofiwun.rf.gd/more_knowledgeable_other.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e563286-1a6d-4dbe-baf9-928cfd2753f2/simple_present_easy_exercises.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_55f0cb34b1954ca18cb9960adfe02cb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a67c82e-9a03-4fae-ae2e-4a9370020387/how_to_get_samsung_refrigerator_off_demo_mode.pdfIn PDF document text
    • http://bedegotix.epizy.com/business_model_generation_canvas_espaol.pdfIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_9fe1327f1d6740f59c8bf104bd680e36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/2014_bmw_x1_how_to_reset_service_engine_soon_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08462ddd-7253-49b7-95f9-1d617ded348b/jp_morgan_chase_bank_head_office_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f9a239-f232-465c-964d-4d9b274b9e82/do_navy_officers_get_signing_bonuses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d57c68-c3c8-463a-af8c-abf0ccc4953b/sofixilopubovipavubir.pdfIn PDF document text
    • http://mizujem.epizy.com/tifuwowatikin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 5284 bytes
SHA-256: 20db42767b0a10a98b0b618fc22805f8a3f81c07ff71bb5874c9f0705bf0a8d4
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 11460 bytes
SHA-256: d4355403cc533779db1ad58b5f6acd885ec1fef77f02f4a32605230623b14987

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