Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6739395543a9395…

MALICIOUS

PDF

74.9 KB Created: 2020-12-19 04:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e6f326804002ac11d111e883b5034af6 SHA-1: e4f5148dda7a62bb7d6a454ec87b67059e033f2c SHA-256: c6739395543a9395d458965888672ebb4f7c80adfa96e83a31fe4f46a649922e
214 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 and routes users through malicious redirector infrastructure. 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
  • 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://ggtraff.ru/strik?utm_term=dasher+messenger+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f991df61bae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_5fb69aad3ac93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_5fbcf767592bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5f8cb962a7c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f89f1647e213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5f8b3cfb0ffdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5f8bed115f7b2.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/da08b1d34fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f975fade8700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8ce3bac4839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6723565-8045-476d-b30e-cc75caf525fd/semanagipusubewofil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5244cdcd-3bb4-4db9-a6cc-402aa18ae29a/lejelaked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1186b63-0f9d-4c3c-8781-a85422e2dcd8/motorola_cable_modem_sb5101_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44511be1-a867-472e-86a7-c7411f5fab0a/administrao_do_capital_de_giro_ale.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/63745934372.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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
stream_004_off0000f282.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF282 24892 bytes
SHA-256: 68e53101d4e177dd04096bc465f20691a92fcb1c4ea1133ea070732b45be6f9a
font_00_sfnt_off0000bbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB4 5264 bytes
SHA-256: b686fe9f52059eade949ed324f6362030d68001bb51e7c8feb58593df9c5b596
font_01_sfnt_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 11176 bytes
SHA-256: e2f2eb93b729f016f6b3fb6f539296c104030372ca907f870065dd304d6784f5

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