Malicious PDF — malware analysis report

Static analysis result for SHA-256 157d4fd5f3f21a1c…

MALICIOUS

PDF

76.1 KB Created: 2020-11-21 05:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9e29da1920b8d9da02fcb56ccc325d49 SHA-1: db3788110bf14f09ca0be4c9c7d1944f8ab3d58e SHA-256: 157d4fd5f3f21a1cfc61e688ddfba7dbbb24e097f9f8facc5be1df36e31f627a
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 0.9995

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://traffnew.ru/123?utm_term=vpn+pro+apk PDF link annotation
    • https://jawuzinirofona.weebly.com/uploads/1/3/4/8/134886132/1229255.pdfIn PDF document text
    • https://xirugavo.weebly.com/uploads/1/3/4/3/134337246/xonox.pdfIn PDF document text
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/jejojagejidim-bixefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_5fb4a96f59b57.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/6181531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_5fb8760f8ae72.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/pazifetanegapu/69219862241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c39fb3-9a47-499e-af54-1c5cffd7088f/fipamalozomegakeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235d160a-8944-445e-b61d-2164a8792637/method_of_undetermined_coefficients_guesses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fdd3ba-d461-4130-af8d-7b9028873e7b/modusitodutumedakagotusa.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/bter_exam_form_last_date_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c61658f-6328-4b86-b529-a9961c9a1747/aqua_shot_underwater_digital_camera_driver.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 4632 bytes
SHA-256: dfa6e8f05b20d92f90aaac9ff2b41b9606dc1c87a41cf29cb68ba709245e46e6
font_01_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 4440 bytes
SHA-256: b57f53c110a6af6647ed8b6783812de649cdc515eccc74b633a0a780981d5a98
font_02_sfnt_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 10680 bytes
SHA-256: 7ec32ceb938a781d6415a12859b1a4b8bed84c29041446f3d591fc7414cf1ba9
font_03_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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