Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1de33e712afb04c…

MALICIOUS

PDF

128.3 KB Created: 2020-12-30 05:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dc8843520ad5b5afe635dbfde949aa5d SHA-1: 627a1396669bb85e8aa557b356def42a3deb0722 SHA-256: a1de33e712afb04c3f2bb4975d1fd7c1f1bb8d39b51399d5424df48bea815202
196 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. It uses a password-protected-archive lure. 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 0.9994

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffine.ru/123?utm_term=metodo+cientifico+pdf+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5f98c9a8626d0.pdfIn PDF document text
    • https://resowijex.weebly.com/uploads/1/3/4/6/134681832/kabinumezuzovum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fcb0b24c31f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f93f8831df01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f89577b7446e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5f997ef0cb051.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/a7b0bc2d-ad93-4002-85b8-1d603fe632bd/duck_hunting_baby_shower_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa49b059-dc6e-4377-94c1-305e35c34269/trucker_joe_hack_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6555b357-ecd1-41f6-a6b3-c83940cac866/living_the_80_20_way.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a39033-77ca-40f8-b785-f50e736d9c09/cohen_monster_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bb93cf-3724-477d-82d7-2cc13772ed8f/boris_akunin_the_winter_queen.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001c546.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C546 24944 bytes
SHA-256: 54bb3180af5d678027e7fc1e62d248417b437a665bf96052cbf66f50c81207c5
font_00_sfnt_off00018b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4D 5076 bytes
SHA-256: 31d438da0a9fb2a42892c8aad7f0a081590ad7d542a4e4c6c872bac2e3f52963
font_01_sfnt_off00019c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C9D 12388 bytes
SHA-256: ba227a3192ae5da092d95b8aefc6d68b0beaf22058ea71db37f101f2999e4a33

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