Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c9ad04778f8161…

MALICIOUS

PDF

77.5 KB Created: 2021-06-07 18:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1e9b395b54f7ed778df6706db9b08c3c SHA-1: db1eefa67a6ee620fb842b24a1c5a5e016c416b9 SHA-256: a4c9ad04778f8161e64e381b19e66a30b79466e24385d2fac00b76faa75fe3a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting it functions as a link farm. One of the primary URLs is 'https://drafthe.ru/pbw?utm_term=diccionario+lengua+de+signos+espa%25C3%25B1ol', which is likely part of a campaign to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/pbw?utm_term=diccionario+lengua+de+signos+espa%25C3%25B1ol PDF link annotation
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/zafiwen-sewavadubuval-sotowuko.pdfIn PDF document text
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/likexaxit.pdfIn PDF document text
    • https://sebazolilerop.weebly.com/uploads/1/3/0/8/130874482/lubiza.pdfIn PDF document text
    • https://tipovasikuvo.weebly.com/uploads/1/3/4/0/134041160/pesulamujulese.pdfIn PDF document text
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/2114539.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b5f67f98-5836-4a1a-bc8f-14c9bf00e819/adobe_photoshop_7.0_video_tutorials_free_download.pdfIn PDF document text
    • http://wotesova.pbworks.com/w/file/fetch/144801198/crash_bandicoot_warped_descargar_para_pc.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144604614/sagokubud.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144687675/71536711294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc86913-13f7-4e30-a516-bf5e5f91bc0c/babujetixak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20051f3-8709-4390-9f24-b3bc076bc84e/how_do_you_reset_a_kidde_lock_box.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144587331/zulovuxiropatu.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/51964168978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0fe7fd-22d6-47fd-b211-1bdb041ef52a/bagonewedojeror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3aa666-5f6c-4bf1-ad4d-05a3350769d6/bootable_usb_windows_7_install_software_free_download.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144770097/93121349008.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 5252 bytes
SHA-256: f8da33adc57a4c05f7e7632dd6bfd805b3da05db4cad6ae8218fd3548693f604
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 12580 bytes
SHA-256: e114febede749f50f051ee3765389e069ef2875b4852eebe163f8ea29e288478
font_02_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.