Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a91f95f96e9901…

MALICIOUS

PDF

69.3 KB Created: 2021-04-01 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa4cb56f16724be7bdb080bdf6e4bbff SHA-1: cb4623653e7530e29ac9a1aaf99eee32448fa2c9 SHA-256: 54a91f95f96e9901165d437b2bf91a76947558e60e41d88e2744b7178d5abeb3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=integrated+manual+therapy+shoreline PDF link annotation
    • http://puwufonizezez.22web.org/dell_active_pen_pn350m_driver.pdfIn PDF document text
    • https://kagepejipewabo.weebly.com/uploads/1/3/4/8/134871264/45875dc57e6900.pdfIn PDF document text
    • http://kokilubowo.22web.org/dateline_sbs_reporters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_6050c5784554c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393925/normal_5ffca18134196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424043/normal_6003898032218.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/hA9U9Oy/classification_of_tissues_anatomy_worksheet.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/kuberewizuwemilelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_5fe743f1de4cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_60216fca6cb21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_6038caaf3a702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_605ab307493ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_601e8c40bb125.pdfIn PDF document text
    • https://goladamopalej.weebly.com/uploads/1/3/1/3/131397974/6b55a80b844b632.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/Yji0ije/congo_conflict_minerals_act.pdfIn PDF document text
    • http://salonlabs.xyz/david_attenborough_dynasties_australia_tv_guidetuxal.pdfIn PDF document text
    • http://axecheat9.xyz/89795693131q57se.pdfIn PDF document text
    • https://bogixeguwumuzu.weebly.com/uploads/1/3/4/5/134503630/3437443.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/hejghhg/advice_chat_rooms_free_no_registration.pdfIn PDF document text
    • https://kanoritixuvu.weebly.com/uploads/1/3/4/8/134874131/710d90f964ed67d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6057b45ed2da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_603408bd4e34b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 5412 bytes
SHA-256: f28461dddc77f1d4cd8e544533f6da7269f56e023dabfe5b8d02158612449f27
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 10392 bytes
SHA-256: a769eaa11e94d25ba1f819836e586054f362fde8368bd4b717f7efce41a6352e