Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8f2529324b139a…

MALICIOUS

PDF

76.1 KB Created: 2021-04-01 13:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 970ee21e0ebc0c89d65708f432044046 SHA-1: b07854dd898154d9a747cc4059ad6bdd972c0a69 SHA-256: 7d8f2529324b139a5e0fe1d92241e551a9840e543914c00bc6a088e7ac38eff2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/award?keyword=mk+pandey+analytical+reasoning+book+pdf PDF link annotation
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/5786441.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/kerurafixejarasel.pdfIn PDF document text
    • http://wegoradubi.sportsontheweb.net/tipos_de_abandono_infantil.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/2338492.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/local_anaesthesia_in_dentistry_baart.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/wofolab_turataxekaneluv_dometel.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/silekofarin.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/4943b115-21c0-48d1-ab7e-9aa0b7d6b743/which_electron_configuration_violates_hunds_rule_the_2s22px22py22pz1.pdfIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_13673747a6054320b702239dae3ce492.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5ae821-9af0-4a46-8063-f6cf1891e14e/12190907128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be6d42e-effa-432f-b82d-ce0ce47e71c0/play_analysis_worksheet.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_3d547f078ba3478fadea4913c4107b0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3cffd7-8e22-47d4-b254-38928671d89a/panasonic_phone_silent_mode.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_8515ce7f56b8485e95bc41c7604ceac5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bcb651-99cb-4053-8482-73598f7f01e4/25526357079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea66578-0a57-4192-b68b-82a56eada689/31475152010.pdfIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_949d128aca5d467990e2503394240ea9.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_2c7839eb4f274005a8af1f568b96df50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6308bc72-e10f-46c5-89bc-0830a6509f04/how_to_clean_automatic_soap_dispenser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b96dc36-393d-4b28-aedc-aa033550f59d/banavifebuwubefopuxifu.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_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 5636 bytes
SHA-256: b68efcfbfa292b804a58cdb1d7707e12f1e1b0c18e77b4f12266ed99d4a6748a
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 11136 bytes
SHA-256: 6eccba8226b89132fd3f9e61632c6781e784df3eb3dfcac7cb6fb3e92a928742