Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf4e47fcde15e42…

MALICIOUS

PDF

81.4 KB Created: 2021-02-22 20:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb0a827211d4982a77387d2e3525dedb SHA-1: 974f61897755eb38c48b315c63d8813861adc7b6 SHA-256: acf4e47fcde15e42b315dcc53638ae44eb601c7c37695afd35adf4adb5fc80b0
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://jottigo.ru/123?utm_term=plantronics+voyager+legend+pro+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407327/normal_6010c65b6e7e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_602fdb061a667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_6016d5c02a166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_602e82c4c1a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475586/normal_5fd8402979f4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375690/normal_5fe1eb172884f.pdfIn PDF document text
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/pososajesemosafitof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff0a334ecf23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_600fb1d4f1d19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367903/normal_5ff64dca41e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_5fda8323c8827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_5fec3fd9c4e2f.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/punurum/guidelines_vascular_access_dialysis.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/spacedesk_android_4._0.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/samemeberezef.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/jizafov.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_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 5556 bytes
SHA-256: 8689b5fc558ea7c6f2280cb7779d02f1fbb9677bed7478fa9d94c32c230cb8f3
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 17552 bytes
SHA-256: ce0890f04e6bd6283e70d06c1b6ca2b10c80499b1329aa4de86751db57b53a5c

Open this report in the interactive analyzer, or submit your own file for analysis.