Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e4d0f6af3547dd…

MALICIOUS

PDF

97.3 KB Created: 2021-01-08 07:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d58d870528a2954742b5589e1a56e583 SHA-1: f572df3136edec224d3c030b335147d637aa9ccc SHA-256: b5e4d0f6af3547dde89b84548943891696dedd1c55d4c049626d2815001d6738
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or a mechanism to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain technical terms, likely as a lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=html+css+grid-+template-+columns PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f9095664d7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f8a61e4679d6.pdfIn PDF document text
    • https://kiradaropamun.weebly.com/uploads/1/3/1/0/131070158/1779131.pdfIn PDF document text
    • https://gerunujixode.weebly.com/uploads/1/3/1/6/131606408/6c620.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/FjfshbG/fire_tower_colorado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5fa5773198ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5fab1db286a3d.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/90cce393-1360-4b5d-a175-aa8658833015/82030629721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e93c599-4e5c-4a55-9df2-b01c6e068a98/ffxiv_ananta_beast_tribe_unlock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7c58a4-ab61-4eaf-b10d-8119a6e59934/administracion_proceso_administrativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5eb108-e05a-4ff2-b975-d3830cd2ef06/fapanomude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0022a20d-bed7-4dd7-8877-6224831a8f26/the_one_kiera_cass_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639f89d4-b654-4e37-8396-2a6ab3fa85cf/88639077877.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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
font_00_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 6812 bytes
SHA-256: b9813a12fce3e05000d46af38252613f57be047f7992901f719344219736b4cf
font_01_sfnt_off000133b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B3 5388 bytes
SHA-256: 4bdccf1b89a337d7ac3bc6c287b2f0341a5f2c076dfab3e87f69f4bcad3e1bae
font_02_sfnt_off000145ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145ED 15908 bytes
SHA-256: 502f44a30e8a259c3a4cc1e41cc9489adb3047ddc2c4d825919c12009b5bd25e

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