Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9aeded2d261fb97…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 16:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8cf29afe4c1f1066ccfbf51677e3afbd SHA-1: 200f7bba409fe718b47cc16c1aa72f9811f61c89 SHA-256: c9aeded2d261fb970cf56a6000ae2796562198ad69d3de606390628f9c8e19d9
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large number of SEO-manipulated links. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or content-farming scheme, aiming to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://dafemum.ru/123?utm_term=software+plagiarism+checker+free In PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/0c048b2.pdfIn PDF document text
    • http://efarbok.xyz/how_to_make_guitar_licksmshci.pdfIn PDF document text
    • http://setovewurepenu.22web.org/malachi_martin_libri.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/83DwiFh/uae_exchange_online_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/eWhbWji/zombie_killers_apocalypse.pdfIn PDF document text
    • https://nabaduvikarupad.weebly.com/uploads/1/3/4/0/134096068/buburovixep.pdfIn PDF document text
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/3809373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_6041ef7684c58.pdfIn PDF document text
    • http://stikc.xyz/553565675016krmf.pdfIn PDF document text
    • http://load-bcp.com/las_vegas_travel_packages_from_south_africaiszzj.pdfIn PDF document text
    • http://bluebadgeform.com/864642466266w0uc.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/cwqhits/words_in_battle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383798/normal_5fc66c84dfe80.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://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_1e2ad008f9454c45a9a26471a2c1bd16.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_6ce098bf57ec49b3ad084fbab7e05954.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8e2d97a5098b4832bece055655c1a94d.pdf?index=trueIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_86e497be6e314411a2e9ada5632ac2ff.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_1c98c9bac51842c590c91483d030af13.pdf?index=trueIn PDF document text
    • http://wimidisa.epizy.com/buxoz.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_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 5368 bytes
SHA-256: 11e7c39b1bbcd542d867aaabcae1d6fc42051ef770d1c8d145b259dc4be59371
font_01_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 10660 bytes
SHA-256: fdde20b2e34358fcef8a204db3359fab5cbd6b12977d01e93e3d326f470425d0
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2