Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4aed470d1af7da…

MALICIOUS

PDF

81.8 KB Created: 2021-03-23 10:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 424ef48f67185dd3c1fc4efb9da7e43a SHA-1: e6485aef0de8317df893196f696460695e29a75b SHA-256: 5d4aed470d1af7da5ed6875595fa300c243a4831d83af01013126fda7bb2f64d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=gcf+polynomials+worksheet+kuta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6036a9b4b2052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_5fd7d915a3952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5fd614724a56e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_603a2960cf710.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/astm_a572_grade_60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_6018765f360b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5fe22ddf815da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_6019ae43ddc96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5ff81c7478abb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5fc91878dee70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_60413ee93c303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_4720dacd88f5447fac165162411e88d3.pdf?index=trueIn PDF document text
    • http://getetir.epizy.com/negofozuzalom.pdfIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_8f206e8b8bf6475692e5269385e88c5f.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_ec5e925388124c37bcbe7bab40affc8e.pdf?index=trueIn PDF document text
    • http://ketugida.rf.gd/bangla_comedy_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/40136529169.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/guardian_rugby_world_cup_ireland_team_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/93531108895.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/vugapasebasa.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/what_most_likely_happens_when_lithospheric_plates_move_apart_deep_below_the_ocean.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_5c33ef1fd6904badac678270db9d69fb.pdf?index=trueIn PDF document text
    • http://kadoxosin.atwebpages.com/pafonalesazusi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010e38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E38 23304 bytes
SHA-256: 51420f24c00b75736d10b9b7766b7b14ca994430f792685a504e8d569e64c7a1
font_00_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 5544 bytes
SHA-256: 0ebbea694405f9824bcc915ffeb4c510833d5e57ba1cc245103d0685d5a51395
font_01_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 10348 bytes
SHA-256: eeec1e59a42eaa04e08ab57804e004e41e42e72a7cf85360a3d5e3eea8076d46

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