Malicious PDF — malware analysis report

Static analysis result for SHA-256 2154e082ef24f683…

MALICIOUS

PDF

71.9 KB Created: 2021-02-16 10:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1408ff30dea3caf53ce39168dd3efc19 SHA-1: 198431c509e9475c560d6b10c03c5b24ed691180 SHA-256: 2154e082ef24f683f0bbce5868dcc4c80292d596832f8997e8987e59502b2324
216 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 brand-impersonation credential phishing. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://buritozube.weebly.com/uploads/1/3/0/7/130775753/3ed73.pdf.
  • 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/strik?utm_term=data+warehousing+specialist+ooh PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401976/normal_60054071006b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fe180868cd08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370987/normal_5fe160ab651ba.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/3ed73.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/hjqirjZ/nitro_racing_drag_and_drift_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501482/normal_5fcdb966ac065.pdfIn PDF document text
    • https://dafemiperufukoz.weebly.com/uploads/1/3/1/3/131379503/rawidole_wugozupixut_sopemibifakowog_megewidafopule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601456e35bade.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/heyuVgc/63941616753.pdfIn PDF document text
    • https://rugisuvo.weebly.com/uploads/1/3/4/4/134438002/13886050615dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sokutuwinal.epizy.com/7945737558.pdfIn PDF document text
    • http://nulanajivokavos.rf.gd/world_of_warcraft_insurrection_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/nidepavawek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 5168 bytes
SHA-256: bc7dcafbddb35d9f9c644f1245568110986a3d14672e095901488dad286c7f20
font_01_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 10768 bytes
SHA-256: 7b0da36766af39020767938bf673fcf13b95166a0e03efdf397c4f10ad02d261
font_02_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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