Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cef037be3cdef96…

MALICIOUS

PDF

91.4 KB Created: 2020-12-24 21:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 61a5c125c03c2a50298cfafd6a074a60 SHA-1: 97e05048694d2d6c6c651ae0483900f2f3c9ff30 SHA-256: 4cef037be3cdef96131ef89ca83e9769ef2a6870d4e8be5da627b291860c489d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://trafftec.ru/aws?utm_term=gotham+bold+font++windows', appears to be part of a malicious link farm designed to redirect users. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafftec.ru/aws?utm_term=gotham+bold+font++windows PDF link annotation
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/sesubirudo_notelatevo.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/RPio59J/41629537552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f88d4fca7bf4.pdfIn PDF document text
    • https://cdn.sqhk.co/pusutekexu/dvjfmii/climby_hammer_apk.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/felasorarabipis/50746596227.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/vevalepofagosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa895b9-2f4e-49f8-b317-d77a8807a465/naruto_the_last_movie_english_sub_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/60798726715.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/40391845320.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/research_paper_about_cosmetics.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/79178837699.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/vehicle_safety_checklist.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
    • 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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001281c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1281C 23468 bytes
SHA-256: 685f378a438b311ac517b089ddd049b2eeb5c00ee15bb4d1730d5326ec95da07
font_00_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 3028 bytes
SHA-256: 6435fc191ebc38e881df1ca8ecc095919b73462573e702801a286c4c05f9da51
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 5312 bytes
SHA-256: fe90d471499feac262bcc0770a71e3ab3763c735320d9f460f38bb91d1f0a0da
font_02_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 17584 bytes
SHA-256: c4ec812ee6522c9b03242cad48ea881a652324811c9924d4488a4daaa3edf9ee
font_04_sfnt_off000150ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150ED 6068 bytes
SHA-256: e6f5ba150f71d955d173293bbaad0c3de5ce2644afc0fec054f3062ff30d8061

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