Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9554f5526d9177…

MALICIOUS

PDF

77.4 KB Created: 2021-04-04 19:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0e03a65668a78e3f96ca397d10590454 SHA-1: fdc2ce41a1326f647e9901cd34ca68b1b9e2e6dc SHA-256: 6d9554f5526d917720caf255e6ff98a3e17651dc5697ece341a90d219235ce53
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one pointing to 'ponafet.ru' which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for links, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of numerous unknown URLs and the ML classifier's high confidence score point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=replacement+battery+for+uniden+udr744+monitor PDF link annotation
    • http://probnik1313.tech/89822333911uq882.pdfIn PDF document text
    • http://ufenmac.com/generos_literarios_epico_lirico_y_dramatico_ejemplosjcxxx.pdfIn PDF document text
    • http://netewe9.xyz/baxigupunkinb.pdfIn PDF document text
    • http://winoraama.website/4353650835564mbg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469101/normal_6006c68fef436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_603a136012165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ff80830f1059.pdfIn PDF document text
    • http://reassurez-moi-fr.info/67137541080ka7xx.pdfIn PDF document text
    • http://spiritstudio.ru/java_resttemplate_x-_www-_form-_urlencodedzzyjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_6041953400cbc.pdfIn PDF document text
    • http://alexandreablog.com/rozeradurajuj4tcm.pdfIn PDF document text
    • http://worldworkbook.com/saturday_night_lounges_atlantaaiiu0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_600cf7a16d497.pdfIn PDF document text
    • http://fakts.design/58257308132hdtno.pdfIn PDF document text
    • http://afracheat8.xyz/34828249045gdov8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5fe6259e0db1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5ff54b5fdb18f.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/buwosevax/adobe_media_encoder_cc_2015_bagas31.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/hp_4500_printer_wifi_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77331fcf-ddd6-44ed-8488-d24755b83922/peterson_field_guides_stars_and_planets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732f8cce-b86d-4277-a05d-fb098bbdb944/fodmap_lista_cibi.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/sipinoxazikapumafakorogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a4f33b-a4ce-42f2-9207-ff3887b1814f/ziredowoxutumawaxasokuros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3217d3-76b0-4220-8c83-d0cb8b4fdbc3/76869872397.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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 5540 bytes
SHA-256: e52c6ac382d48722f87be891c6685450155eb05779bdbf55c2b2291a80c7d22b
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 10580 bytes
SHA-256: 2ab963978984f401cf7d62fe3bc328c80aa47b6c98ff2dafc8511d70dcfaced9

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