Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bd08c658a93e3d…

MALICIOUS

PDF

71.7 KB Created: 2021-03-09 09:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4ee998a8e2459b0888dbc97e8600ebf4 SHA-1: 284cf3b8a05ff4302f4db1c436ea39c3a998a81c SHA-256: 44bd08c658a93e3d2cb139ce81b9d466f0f2cf0187855261a030135953c733d6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/123?utm_term=amarula+song+audio PDF link annotation
    • https://cdn.sqhk.co/disumuneriva/mjihgoB/kasututope.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/dgeha2z/wolf_simulator_evolution.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/hghcN2s/alcatraz_escape_walkthrough_metal_detector.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/ghj6U0y/46241672825.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/455b6160-feb5-4c57-8a89-06964e5435a8/how_much_does_a_po_box_cost_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/omb_a-_122.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_bffadf3176584a15b74fc213e7270ed8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/tusonasawulizezojozaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6908604-a7b1-4ed9-b90e-2c7b5f183d38/zugosituvoluzubijir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f33654-83a5-4543-94c5-4a5ef126a72a/zivuxalasa.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_654d1e56fff14844af70ea0ec866d0cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b1f4866-0bfd-4ab9-8963-1955dad1e932/autocad_2013_student_product_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e9ef94-57c8-4cca-a3c5-0bdf2e3582a3/chuck_palahniuk_survivor_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13adf263-2cbf-439c-8458-459010c21578/pro_bono_criminal_defense_attorney_portland_oregon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7396e703-0277-498e-a835-f31a53d5a3ea/in_the_heart_of_the_sea_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d4bef9-7fe6-4874-900f-4ae45c02ec08/74444795529.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 4820 bytes
SHA-256: 1ad96c51f17e4c0e2e11ac6f89d2063787e6adb538f6e0465fa248cb9099f1a2
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10908 bytes
SHA-256: eea5229a75a18d15816d475e1481567bcdc908414f5d785e16cde1df53bde54d
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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