Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fd078ebb738a8b…

MALICIOUS

PDF

76.0 KB Created: 2021-06-07 14:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 716dcecfd40c64445a57ecc3e61a8f3f SHA-1: 6854ee83d4a67801d59633397990a59d6e7c9e29 SHA-256: 59fd078ebb738a8b1edb85abfe818796304efc0dcef24212ed3ffe4682fbadd8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, 'https://infrive.ru/pbw?utm_term=istatistik+vize+sorular%25C4%25B1+a%25C3%25B6f', appears to be a redirector for this link farm. The document body, though heavily obfuscated, contains text related to statistics and queries, likely a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/pbw?utm_term=istatistik+vize+sorular%25C4%25B1+a%25C3%25B6f PDF link annotation
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/jijogobikojalobow.pdfIn PDF document text
    • https://waretufiwad.weebly.com/uploads/1/3/4/5/134581883/7931264.pdfIn PDF document text
    • https://nugaxuraru.weebly.com/uploads/1/3/5/3/135388114/8766796.pdfIn PDF document text
    • https://jiziweradufib.weebly.com/uploads/1/3/4/8/134847172/jedesodujarenozade.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/roxeridopevi.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/bilefe.pdfIn PDF document text
    • https://fojobalulebutot.weebly.com/uploads/1/3/4/6/134697339/1846825.pdfIn PDF document text
    • https://logavamu.weebly.com/uploads/1/3/4/7/134746434/4714017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ff6cec33c3f6.pdfIn PDF document text
    • https://derodukiv.weebly.com/uploads/1/3/1/4/131453370/68556f9ba.pdfIn PDF document text
    • https://dunudodijozu.weebly.com/uploads/1/3/0/8/130813966/livuxabawag.pdfIn PDF document text
    • https://goziluzigawu.weebly.com/uploads/1/3/2/8/132816100/2672920.pdfIn PDF document text
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/togisunate_rinur_keneniwoxavo_xabobu.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/wosiraj_vapanenena_wobojakani_mafabimarepaxi.pdfIn PDF document text
    • https://mumimobubaw.weebly.com/uploads/1/3/4/6/134640569/1942624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_60345f2a50732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_6019cca9e78c2.pdfIn PDF document text
    • https://xofilovinavi.weebly.com/uploads/1/3/1/3/131379248/dojikurigarulat_razowobub_nidefuxuxo_fomaxokuted.pdfIn PDF document text
    • https://jolezutixuzusav.weebly.com/uploads/1/3/4/6/134605000/gakidu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5ffdfc175bf29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e55abd9-f997-4ecf-9bfa-ad84c7665391/universe_sandbox_2_download_apk_dropapk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9e2948-428f-4c2d-a223-c45d4b72abf7/96283843424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c411aa1a-1a08-4090-ac4a-7eb9905ee8f6/how_do_i_set_the_timer_on_my_timex_ironman_watch.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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 5044 bytes
SHA-256: abd0981c1bbf3e90b7a5cec5904f4318afacd663ee63b5b163fdfb2aa372e580
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 13960 bytes
SHA-256: 93af49c8ece9ea12c9b263f078a9423cf022e89b0cf7e35fb54cd4f283acdf69