Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd9a256a1023766…

MALICIOUS

PDF

81.8 KB Created: 2021-03-17 08:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: cbd27eabc8bbffe19e45f2708888df2e SHA-1: 54509c62d7c00021d47430a01da7901ab99c320c SHA-256: acd9a256a10237667bd9c18df17d8802cce0210ca573d2e6c25db956c81aa01c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'blue chips movie'. The presence of numerous links on disposable hosting further supports a phishing or redirection attempt. No scripts were extracted, but the malicious URLs are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=blue+chips+movie In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_6011788157c5b.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/xUhjZDo/20869916123.pdfIn PDF document text
    • http://hs-life.ru/3306935910821tro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_6034da7f2b12a.pdfIn PDF document text
    • http://testersairf.xyz/51640250542dlnc9.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/qjb7vid/mugalisavusuzazunubub.pdfIn PDF document text
    • https://morisoxurekes.weebly.com/uploads/1/3/4/4/134464458/77c6df044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_600e71ad835b1.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/sfhh9S3/monkey_go_happy_4_level_11.pdfIn PDF document text
    • https://cdn.sqhk.co/mogilirexexa/i1mjgi3/2107.pdfIn PDF document text
    • https://dusadekare.weebly.com/uploads/1/3/5/9/135993409/8151501.pdfIn PDF document text
    • http://menformula.xyz/setur9mdx7.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/hjiafVF/45351190393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472503/normal_6008412a3c084.pdfIn PDF document text
    • https://rixatesar.weebly.com/uploads/1/3/1/8/131871899/698058.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/gazijewevan/automate_data_entry_excel_spreadsheet.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_0355f02e77a240669bb211dcf2113e8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/chrome_for_ubuntu_via_terminal.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_801ed41cf2ab4908a63b38e3d84c3ce2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/inventory_balance_sheet_template.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_ddb1a97f73c849c8971074e5a34ac302.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_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 4976 bytes
SHA-256: 5cef41e2a6860e270097b53fede84fe0cba92a73762a2dc70f55828387414a9b
font_01_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 12640 bytes
SHA-256: 97b39cd3035f898a22079ab46e1fb2d009c7b5461329f03b9f78e2aa652a47ad

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