Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce926b5edb0cc42f…

MALICIOUS

PDF

87.4 KB Created: 2021-03-18 03:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb4d25d90d5f6f692db3450466af46b9 SHA-1: 107d09c612df6b4b3a58c00f469c66be5e545447 SHA-256: ce926b5edb0cc42f8082f344572e2151c95f8eb0697325520c8e99926f862979
254 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector at 'https://crophysi.ru/123?utm_term=insurance+card+template'. The document body, though heavily obfuscated, suggests a lure related to an 'insurance card template'. The presence of multiple external links and the ML classifier's high score indicate a malicious intent, likely phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/123?utm_term=insurance+card+template In PDF document text
    • http://botanilix.mygamesonline.org/putuxuvetuj.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/fBibxid/wedding_expenses_spreadsheet_template.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/30321462429.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/atropine_davis_drug_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/f7hfNjg/59155677356.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/55995717490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_d3923a03f8a34560bd97a9482272d67e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/stalker_call_of_pripyat_trainer.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/franois_charron_informatique.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/66505440772.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_67807f9b49dd45738918ad38fc9d76e7.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/57499477417.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/dupili.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/does_costco_perform_wheel_alignments.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/filad.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/c_template_array_class_example.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/casio_ga-1000-1adr_g-shock.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/holes_by_louis_sachar_activities_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/83126938170.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_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 5156 bytes
SHA-256: 56721f3e097bbd21470fcd448a129bd93ca118fcf3399f827b6e033786fe0466
font_01_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 10568 bytes
SHA-256: 99b27792763a8b1dd8486a0ad1cc79fcf5d4060d116c466a78b0ca6dd8a055a6
font_02_sfnt_off00013ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD4 16232 bytes
SHA-256: 68eef4b610644b6a98f668349b58b424e8310755c20c018328a8321db0e17a89