Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54e1ee45db2eb96…

MALICIOUS

PDF

77.7 KB Created: 2021-05-24 08:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d1f31e29687ed7493d7bc3a97ba4d59c SHA-1: 4f7ee7db3445e9b14123e99eea2ffb3f59d42b16 SHA-256: b54e1ee45db2eb96191f02e1495d9c2626fb906a5d750441ac0a79cf9564f6d0
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary malicious URL identified is jumiwimov.ru, which is likely used for phishing or malware distribution. The document's content, though heavily obfuscated, appears to be a lure related to financial queries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=how+much+does+cash+app+charge+to+transfer+money PDF link annotation
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/piboxaxutapuna.pdfIn PDF document text
    • https://xuwawimo.weebly.com/uploads/1/3/0/7/130739806/bomanuzizamor_jidexevej.pdfIn PDF document text
    • https://maviruwatibifiw.weebly.com/uploads/1/3/4/4/134490209/6973381.pdfIn PDF document text
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/zikefegogizalujixi.pdfIn PDF document text
    • https://sozikusek.weebly.com/uploads/1/3/4/3/134333331/paguke-besumara.pdfIn PDF document text
    • https://jogotipopawufi.weebly.com/uploads/1/3/0/7/130740597/nevarenatilulin.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/838b8e733cd4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_606330fd0791a.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/petoxoriretuta.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/1914a5e6e64165.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/1070893.pdfIn PDF document text
    • https://ruxevikupasej.weebly.com/uploads/1/3/4/6/134663562/1788337.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/9558337.pdfIn PDF document text
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/labuniv_dafewevoxixaner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fdae89ea0bd6.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/3fad79ed-31e5-400e-a7a2-5e01032a30cc/what_is_the_use_of_hr_management_system_in_an_organization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f73907-c7dc-410c-97b8-32e3963bdf39/2nd_grade_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/xinesukubawewelumavi.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/seoul_subway_map_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/bgt_2018_lost_voice_guy_all_performances.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef414a0-6a01-4b67-a151-7d1dffe33901/jobulumirebizidanudu.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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 5528 bytes
SHA-256: ca1a930b898330f87acf1c9d51f7e774bf2764e21abed3667a5d57afacb6edd0
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10684 bytes
SHA-256: 2528650da66ee57011d5bb58ba963a2d255f994fb43d1a86544b3ffc0bb069ef
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230