Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1dc74e619b063c…

MALICIOUS

PDF

88.2 KB Created: 2021-06-08 09:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fdc49d676bcec1987e15edb1b5eaa425 SHA-1: 5da5444ad56fd72242466855a20d402522daab72 SHA-256: 2c1dc74e619b063cd80832787f13fbb3d28bd96a139cc10a7393d090b8318dba
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on redirecting the user to a phishing site disguised as an Outlook web app sign-in page. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting. No scripts were extracted, but the PDF structure and embedded URIs are sufficient to infer a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://medvor.ru/pbw?utm_term=outlook+web+app+sign+in+page PDF link annotation
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/1d040a1400.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/4b4d01c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_60589ae711952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383452/normal_600255781a326.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4407991/normal_60b003d37cee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_60420041c8aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_6064f0a124d88.pdfIn PDF document text
    • https://wixiwifutavoma.weebly.com/uploads/1/3/5/3/135301275/7651613.pdfIn PDF document text
    • https://watigubirokomud.weebly.com/uploads/1/3/4/3/134310871/foliwajene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461505/normal_5ff32be9c0517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_6037f1714c9fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468296/normal_5ffa4de4d9ce1.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/9680504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_6056505c7c239.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://uploads.strikinglycdn.com/files/78263c47-3ddf-4a23-882d-dc91a333e37d/be_going_to_and_will_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea722016-049a-42ef-a5f1-3de7ca6db34a/zekadisivixomabulovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde8dcfc-814b-4dba-a228-b398424f6fd7/77704672548.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144665862/r76.8_other_specified_abnormal_immunological_findings_in_serum.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/ge_monogram_refrigerator_ice_maker_stopped_working.pdfIn PDF document text
    • http://gonikob.pbworks.com/f/sifobe.pdfIn PDF document text
    • http://wurutaw.pbworks.com/w/file/fetch/144712341/food_wars_season_3_english_dub_funimation.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/f/senetevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c844ebc-0011-4cc1-8b07-a848ed35c6b8/how_to_install_omega_rd_remote_start.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_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 5096 bytes
SHA-256: 26257e39b96cd636139487ca7e04508ee02426e7545e8c8479d6b07f2ead5c16
font_01_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 11184 bytes
SHA-256: 95372e92a38226bdb75460c6c36e1cf13e3910536d0d47cc9bea315e838644ec
font_02_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230