Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6b6887b2bf31cb…

MALICIOUS

PDF

72.5 KB Created: 2021-03-24 12:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c5f8477dce04a74e8b1521dc5bb5f7fd SHA-1: 2fda861b5738da79ccf7d32f5c123e9340016242 SHA-256: 1f6b6887b2bf31cb75e50420c8d9d80a9aa75179746bab09d3736996a66b8dff
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL being `https://pelibifir.ru/wix?keyword=happily+ever+after+pdf+free`. This suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pelibifir.ru/wix?keyword=happily+ever+after+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fce874b3ebf1.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/c997901.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/a1997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_6022009044e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/erReYha/sudakarufofusokarej.pdfIn PDF document text
    • https://fagovuwafarawa.weebly.com/uploads/1/3/4/0/134042706/0dfac0b5007c8.pdfIn PDF document text
    • https://webuwexuzebonal.weebly.com/uploads/1/3/0/7/130775053/fonesama-livimas-tavesabamalavuw.pdfIn PDF document text
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/5895335.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/7CSbVhh/best_free_secure_folder_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/jcxjf4i/41304690788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_604623d44727c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_6028ad51c58be.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/hihhfjh/7583131070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_60152b924474d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_80deb4c00dee48ddb90352afafe2788b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/john_deere_l120_parts_list.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_84a876b715dd46d5a684f94b51757f5e.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_c1fcfc9361604f7d902003c523efcf20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c011a388-1dff-42f0-ae45-3c9713e07fb2/how_to_get_specialty_certification_in_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80d7de8-7b47-460f-91d0-450f03904c1b/what_words_describe_sherlock_holmes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be46636b-2fe0-4476-a2c2-26791e4daf46/homelite_blower_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/mowibuzuxodoxunuvubigexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249b3c0e-2f85-44bc-a793-ac8d29004c92/ginukin.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_ac81484dbf744084aea014dfcfc275bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/marquis_de_sade_juliette_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007bb14d-303e-4e34-b999-e8e52a965960/pusifu.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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 4980 bytes
SHA-256: 4f0ce55c7763bb5345c1789b2fc9e744d740187b5982356bb5aea11966051983
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 11224 bytes
SHA-256: c2085fcd7c3cae4881eb1d4269790c896d5ffa9b01ed3785e2849a8f534ac559

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