Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c37558cf1b777d…

MALICIOUS

PDF

77.6 KB Created: 2021-06-03 08:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 432058f76d14d4140e74890ea402ba16 SHA-1: ca74a2c4224ed3babeb81e62128f8279e8a2d0c9 SHA-256: 53c37558cf1b777d07d0108c6b8dbe70d9b465ee8ac29161d84e21aaea0453f4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to contain text related to label templates, which is likely a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/123?utm_term=avery+5163+label+template+word+2010 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449766/normal_5ff7d82f00389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_6025275877263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_60567a2aa0937.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/kuguwivetoxozobuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_60479425675ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5fee91396596d.pdfIn PDF document text
    • https://wajutuba.weebly.com/uploads/1/3/4/6/134656264/4182529.pdfIn PDF document text
    • https://kenometiwu.weebly.com/uploads/1/3/4/3/134340836/rutugafikokike.pdfIn PDF document text
    • https://fivugolukebil.weebly.com/uploads/1/3/4/9/134902908/76e9ca0caa6e5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4473403/normal_60b3c36fd0db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5fd0a287d1db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5fe82466444e6.pdfIn PDF document text
    • https://nanavirirexam.weebly.com/uploads/1/3/4/4/134474519/zoduperajiji.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/d4865aba-7ca9-4979-88f0-cd0c9eb55998/genifazugafur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c12a3a-eba7-4ce7-90df-aefa3ff81a74/98176237517.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144439914/how_to_put_weight_on_a_skinny_cow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ba8cd7-4718-4210-a6a8-4fb53d218378/61768988819.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144510174/bsc_3rd_year_industrial_chemistry_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3426e643-4089-4d7d-a3f3-1dd6e88cc70a/notafaxemifak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4188c0e-834e-49f3-9408-b222cc5e432f/sample_of_profit_and_loss_statement_for_nonprofit.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144529665/72029866087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6f622b-711e-4940-a7e2-1bc539b1f0ff/logitech_k400_plus_usb_dongle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacbeb67-bb8e-42ac-9623-0a28799e83e6/visual_basic_2015_datagridview_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c1bd8c-18e9-4811-892e-efd78bfa296b/what_is_social_rehabilitation_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d310bd-03fb-4f7b-ae8b-d568387b57fc/conflict_management_styles_examples.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_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 6080 bytes
SHA-256: f38fd0b6de3c2d85c252019cd54574825ae2c565c6750f9273e56f6f6bde35c8
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 10592 bytes
SHA-256: 50e0fdb267e0ff61508e73d2e66203bb72770ac9571b3e0137c129ef05f8baaa