Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9451b0cb983d4…

MALICIOUS

PDF

67.9 KB Created: 2020-12-18 07:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 52bd8e13716788ea96e58edd4c9b37b6 SHA-1: e3eb2b161db238cf660b11b539c4b82e1763164c SHA-256: 79c9451b0cb983d4ecdeb9a6a92a2b2e4bdf9e5a7ae76ee13a7543c64883e5e9
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic indicating it is a link farm, with numerous external links to PDF files hosted on weebly.com and other platforms. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking these links. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafficel.ru/123?utm_term=average+daily+balance+method+to+calculate+interest PDF link annotation
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/pekamo.pdfIn PDF document text
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/tomilazinoral_zugoxupegim_lepire.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/a28b7eb384.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/289489263d16477.pdfIn PDF document text
    • https://judunelikirolo.weebly.com/uploads/1/3/4/3/134375477/bogivarekax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53479d7936484084ed80/1606374217183/53511657733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f9702e-7fcb-4fca-8e4b-56424fffefef/saginaw_bay_fishing_report_sebewaing.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2985d3dfdd95b60dfe79a/t/5fc92b1c0ff59e308eb114d9/1607019306450/62642132971.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b7d9c89b935f15e3f851/t/5fcb3fd48dcc5603bef1492e/1607155668321/bingo_wings_workout_at_home.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc117cc3398ff75152f2ade/t/5fc5d5b1145a8629dc7bbb71/1606800817818/basketball_legends_unblocked.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30874df132613bbcb9d36/t/5fc6f08009f4d56e8f7798d7/1606873217934/how_to_baked_italian_breaded_chicken_legs.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/excel_if_then_format_cell_color.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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 5644 bytes
SHA-256: 64ccc859c120b12884ab28fe20313409cb8a1f93c5318a50ba61c0fadd222f94
font_01_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 10472 bytes
SHA-256: 00e60dccc9a1f01a10544b2f1274d0fb4790b56175113ec68af427d3d5ceb820

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