Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f70caa5e8eac35c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-21 11:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2904d9e393f5fb7cd99d88c5966416c5 SHA-1: b2d3c2eddc67b7250cd77f8e6f346aab1a44e7dc SHA-256: 1f70caa5e8eac35c05759cfb55f728c7ef7e85555b9f85d0ff09fc93daaeb2b4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of many external URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=adverbs+in+english+pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/voxidikevoketip.pdf
    • https://cdn-cms.f-static.net/uploads/4389387/normal_601e0e41b8876.pdf
    • https://static.s123-cdn-static.com/uploads/4370285/normal_5ff23ad72a662.pdf
    • http://xupevagadozojad.22web.org/40697357907.pdf
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/5758376.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_604303a681671.pdf
    • http://naturwows.space/body_temp_android_apph5md4.pdf
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fec064dad76a.pdf
    • https://cdn-cms.f-static.net/uploads/4381539/normal_601596e2bf69b.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_6026d15fccb6e.pdf
    • http://itasummer.fun/witaleiq6ie.pdf
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/gezorudesekitite.pdf
    • http://makukenumeg.22web.org/sigedetem.pdf
    • http://minuette.me/how_to_find_unit_product_cost_using_activity_based_costing6qg2a.pdf
    • http://cheapestshop.xyz/marques_de_sade_biografiaky8u8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_c9172402115f43a998f5f3fca094c977.pdf?index=true
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_146c7c1092e849549ce00b754282f2ef.pdf?index=true
    • http://fetufebutegiv.rf.gd/followspot_cue_sheet.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_d5ef1b687a6f46659223c34ebd7416b4.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_4d392511dd7e42859329d55a1a3bdf45.pdf?index=true
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_b921dc08943f4a5faa042f82626d16b3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede4.bin
a6ea72ce04aac7049311bb1625c0baf7433b34733d2b8efcc5290d2aaffab3fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 4880 bytes
font_01_sfnt_off0000fe5d.bin
3341d64adb3266045c8896907e7b0f4de9e4320181efe2b0d3464ad65b8803a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 10604 bytes
font_02_sfnt_off00012220.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 4324 bytes

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