Malicious PDF — malware analysis report

Static analysis result for SHA-256 891b728c7905a934…

MALICIOUS

PDF

72.0 KB Created: 2021-03-20 02:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 66a5845c9eac9d3bc6f9f4eb7b23c730 SHA-1: 1c91cdb2826a70b0a48615ee3ce206bde5807b95 SHA-256: 891b728c7905a934831421915fa742e9386f349f097f709a25b4479bae966ad6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://ponafet.ru/wix?keyword=modern+combat+5+apk+data+highly+compressed PDF link annotation
    • http://pupezawat.scienceontheweb.net/in_dreams_piano_sheet_music_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_6008207f592e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_6050f47094d5e.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/pemedawilisosig.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/tuwolotojavizi.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/69495659643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_6041ace0d6f81.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/bangladesh_detailed_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_849367db157d453285fa83540884167b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/722dba44-6778-418f-937b-5fb92353ff38/22843728500.pdfIn PDF document text
    • https://64f3f273-fd79-4cea-bc15-92b2431614e2.filesusr.com/ugd/542254_19b46c1502d24193bf976668ff6f805c.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_99e9704a02604cb2ae20d08d04215041.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_fbe08b060d5b4d7bb994f792e5d9659d.pdf?index=trueIn PDF document text
    • http://nizalag.rf.gd/presto_deep_fryer_replacement_basket.pdfIn PDF document text
    • http://wukosinigi.epizy.com/honey_bee_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37edf03d-32ec-4f83-ac3b-808d7b3212da/oster_golden_a5_clipper_blades.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_8683ed3ad3f84f1fbb3acfd92acd4f76.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_d19cfc13a5084b169c30a96379eea160.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_ec2c4321893e4b9c889e7212689f189c.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_b0b7e59d0aa74c9c96d5c8dd53acaded.pdf?index=trueIn PDF document text
    • http://napepezubebefiw.epizy.com/waximeredo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ea0aef-5038-413c-9586-09e4a2598399/vurovunopojuziw.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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 5924 bytes
SHA-256: 0a917274adfe3b665fcdf4f4244643294a8e48a2225832ccfb44f32527a7ec3d
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 10816 bytes
SHA-256: 9561b5326a017d24f20efe1bb99361e9b52c69ec5e676546b785533192f5e8fa