Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1b01e23f19e55f…

MALICIOUS

PDF

76.9 KB Created: 2020-11-30 20:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e38353600ff166c0ee4ffa7b4330ad81 SHA-1: 1922560b92317f5958d1e3507b64928097df2202 SHA-256: 4c1b01e23f19e55fd36f60944910510dbb5bc26cce29a0ba6d767e34c790a042
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded links, with one identified as a known malicious redirector. The document body is heavily obfuscated, but the presence of a link farm suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • 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.
  • 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://gettraff.ru/123?utm_term=geography%252Fclimate+of+new+england+colonies In PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/ketijalugaso_penexat.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/fewisutu.pdfIn PDF document text
    • https://ribifafugulif.weebly.com/uploads/1/3/4/6/134650062/raxivogi_wavetofe.pdfIn PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/2035868.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bekalan.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/ganubatebedoxez/ligipojurugis.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/sorixukisibituv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144bb075-8272-4a4c-bdca-fb13370d7b34/bob_psiphon_2_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc007006609fd0ee78c7004/t/5fc1e293f81c9a2a0ce65da0/1606541973432/sacred_contracts_caroline_myss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003649da-d8d5-405f-89ef-6d22a591e1bb/wabinil.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/5th_grade_adding_and_subtracting_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/63260466392.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/black_and_decker_lst136_trimmer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/89120236998.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/dimension_pre_emergent_granular.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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 5832 bytes
SHA-256: 349e37b3b14f32883784961c63e90837ade8cc8f61461b951c70f50516308b86
font_01_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 10264 bytes
SHA-256: be7469ddb164e8ca24387f1c2db06dcd906b5a17f217aac0d4c8799a2d9dfe93
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 18116 bytes
SHA-256: 5c499ca526629b5702fa6ed12bb45924b23463cae733ba06fddd055216a25003

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