Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68f4a08b6b200b7…

MALICIOUS

PDF

83.7 KB Created: 2021-03-19 14:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 54b453b66fcb31a405e42ea21136a692 SHA-1: 5ae355d88c1beb82bd9b9e44ec47e0f71ec3b731 SHA-256: f68f4a08b6b200b700bf88b8e21526a16ad9b3b66f727b1f96f26db349912b59
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/wix?keyword=discrete+mathematics+johnsonbaugh+7th+edition+pdf PDF link annotation
    • http://cookwellbakewell.com/lemofubokumekojonafu7tjvo.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/8800290.pdfIn PDF document text
    • https://nabozuritofawun.weebly.com/uploads/1/3/1/8/131857241/97d7f46f14.pdfIn PDF document text
    • http://lanejaselisipu.22web.org/cellular_respiration_worksheet_biology_corner_answers.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/xixifarametis.pdfIn PDF document text
    • http://azorocheat6.xyz/garmin_language_downloadc8a64.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/lexugedizavutizoto.pdfIn PDF document text
    • http://coloradocustomelectric.com/sokasezekoxamonibulijezxd7xu.pdfIn PDF document text
    • https://gasovopur.weebly.com/uploads/1/3/1/4/131453365/pakamarutal-sosazefuledutux-pebirowog-tinux.pdfIn PDF document text
    • http://damita.fun/9562900060200l4x.pdfIn PDF document text
    • http://fsbsiod.com/string._format_java_long0pmd7.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/novifamigot/19502975246.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/32380842741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ac7689-320b-4d5e-8a59-c4c09953ebb0/best_way_to_train_for_the_marines.pdfIn PDF document text
    • http://lafonariki.rf.gd/wibiwilipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8046011-149f-4c4f-b863-12c3c2d1cbe8/where_can_i_watch_call_me_by_your_name_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93c979c-8093-406a-ba85-03044d7e97b6/focusrite_scarlett_2i4_3rd_gen_usb_audio_interface.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6a348b-8ec7-4379-9ddb-4d99ba588028/how_to_earn_income_from_dividends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8845760-c31d-4639-bae9-556c9ea3b8cb/luxazasipidofurudap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e05cf4-3ac0-476a-803c-bdda489e05d8/flir_one_pro_android_usb_type_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410affa1-a4ca-46da-9d40-343323573408/86439374505.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5832 bytes
SHA-256: f35f5fd2a61f8698b0715d311058af0a04b0b11162fa4d050d890b8c16d09db8
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10872 bytes
SHA-256: a0c8f599f1ef0f909e8571f8343d1d63147c2978b2a952f34ba8c8ea06a800b3
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 16084 bytes
SHA-256: 6049f7be1eb58524b2bfe5e0ab34f4300347f26dbb23ab6ad605e3b0d5647553

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