Malicious PDF — malware analysis report

Static analysis result for SHA-256 f956c42c33bfc78e…

MALICIOUS

PDF

89.7 KB Created: 2021-04-25 17:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d6e51069ba75a8f5561a2aee083b85a4 SHA-1: d865a04b7077858559648124b23d65ac21339401 SHA-256: f956c42c33bfc78e3ccb410b09e1337175cb837fc6732135fecd0e08f42ab088
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains or cloud storage, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body text, though partially obfuscated, mentions 'Excelsior springs community center day pass', which is likely a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=excelsior+springs+community+center+day+pass PDF link annotation
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/murevi-tubeweko.pdfIn PDF document text
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/6148249.pdfIn PDF document text
    • http://sluzhba1.net/68904365917kx313.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/3641858.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/8401075086jworo.pdfIn PDF document text
    • http://imedo.ru/sopalaravemdrnfd.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/limage-javowor-tafenipe-regij.pdfIn PDF document text
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/zasarinikitex-jewituwuno-vatizaxotipi.pdfIn PDF document text
    • http://rozel.ru/rolopoubo1t.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/dukexajuj/32540123310.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_a1508271688349e7b329d8d6315a410c.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_474cdbf3c1d04ab790b0433f3741aa29.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_71a8b4cf71e9471fb7eac60073e23104.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_00e9f5d1cd584dd78733c17a6d5ab4d3.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_c1a70c0c4c984e998768e5091fc4c61d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/sulipezutupemifokoseponu.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/16496224162.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_7170351304fa4c3090b1d52e3275ace3.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_2ac0f22587e24b1991a1be62d629db59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/75505799448.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_6d077d31bcac47679ed92c11b2e0e2c4.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_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 5520 bytes
SHA-256: 7ef21bbecf4f48634d80aa9ceab3413bdbfe30687035015bcd7065ab3e892115
font_01_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 12312 bytes
SHA-256: ce84690f29f378d5d1d9d8ca0a265c3cef6b35adaa662bfca30b3c440f4288f6