Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3d172ca3de371f…

MALICIOUS

PDF

71.6 KB Created: 2021-04-06 19:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f6428933c87529dc8e883ef2fb23ea7b SHA-1: c9ed0ec92502664d40863f5fb0eb11498fe8dfc3 SHA-256: 1d3d172ca3de371f0227120e86c210ccd685ee65ad2fff21f3081c02a4529af6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through a large number of links. The presence of external URIs suggests an attempt to redirect the user to a potentially harmful site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=diccionario+biblico+ilustrado+nelson+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fc8d71636c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_5fe7357fef240.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/54617093663.pdfIn PDF document text
    • http://rasujipegov.iblogger.org/virofonesiwotalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_606207acc4f25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_5fe551d580991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_5feea095bd104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_6002046aecd40.pdfIn PDF document text
    • http://gutibefatidag.medianewsonline.com/adobe_writer_license_cost.pdfIn PDF document text
    • http://dikagowoxi.sportsontheweb.net/nafakulitajibiwuwuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_5fdaeae3ee6f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_604fa9296666c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_60412ec9a041e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_604d89557cf4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/arignar_anna_books_free.pdfIn PDF document text
    • http://zenujasope.epizy.com/rededavikonukobezep.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/what_is_the_integral_of_cscx.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/android_smartwatch_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746bb5e2-2c9f-4bbd-b915-1caa0763f685/song_of_myself_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80af197f-ff1d-467a-98ff-dec6953cf8cd/58733975907.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/douglass_speech_what_to_the_slave_is_the_fourth_of_july.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/battery_saver_app_for_rooted_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc67d22-22a2-4e08-b2b5-c6e26d5ff954/zokuliter.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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 5288 bytes
SHA-256: 357241e6681dc9963ecde6cba9746d04e5c306d907962e133edeafef87fa6a7b
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 11600 bytes
SHA-256: 5c12d5f8c6f0db2135bcc50895d9d5b9e9ab6eca69c1ff0e8b6c093664a62e5d