Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dc01b713f01370…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 11:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 640d45e4c74e61e231d846a37cdb2974 SHA-1: ddfbc2a452b82f0fd3ffcef90f2fb8b7073c730a SHA-256: 54dc01b713f0137024332fc7036b28cfe29504c80d5c88434c93f698730b1912
186 Risk Score

Malware Insights

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

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 0.9997

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://maypoin.ru/123?utm_term=cp+plus+android+app++apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370540/normal_6000275d04ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_602a19af2f142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_605df8933088f.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/nuwubafowowoso.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/tugekutopasegud-tuvufimabe-tilobe-mejivuzelonam.pdfIn PDF document text
    • https://gazufasuro.weebly.com/uploads/1/3/4/4/134482956/4621003.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/083558a8cf9c0.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/bhagavad_gita_in_oriya_free_download.pdfIn PDF document text
    • http://vofufime.mypressonline.com/3dplm_aptitude_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webuxaxove.rf.gd/80200361555.pdfIn PDF document text
    • http://baxewape.myartsonline.com/kifefabibasidofegemefub.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_a0e84926034d46d78e49ac8ba2ff6ca0.pdf?index=trueIn PDF document text
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_51d1d48297804d8194781c9339bd3c4d.pdf?index=trueIn PDF document text
    • http://napezidemilolez.epizy.com/51013134712.pdfIn PDF document text
    • http://zeraginijumeje.epizy.com/rima_asonante_y_consonante_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/31551055250.pdfIn PDF document text
    • http://jelugubafegoj.rf.gd/kabakaparadezajomizud.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/jasper_report_library_java_example.pdfIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_f6376d14af8e4dbab2f2d59b82e4c7cb.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_24f4c31146164295a38acfd11a51b1ce.pdf?index=trueIn 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_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 4924 bytes
SHA-256: cdd7d1ff5859da6f1a9ccdb2346fa22b9c514ee17f2de7fbd5fa1be8139d2f55
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10796 bytes
SHA-256: 219473e6972c82a52ca1d0a1a5a5e9be8d956cf9d3d7e5490a3dd18eecf78359