Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b06372ee17a4796…

MALICIOUS

PDF

76.7 KB Created: 2021-04-22 16:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 668191d42bb5b08d5f1a659da4ad2692 SHA-1: 56d251990be42e017b9d67a4f253c868066b4ef8 SHA-256: 5b06372ee17a47969eaac2d88e1183864d00186685708bc517a518f1eb23f2be
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=how+to+draw+a+realistic+for+beginners PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415068/normal_6006bf417be07.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/hBhgjwc/77493099357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_600fdbdcb0c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_6056dee6545c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5fe7708baa39f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_605d89b107963.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/tjc66oU/dibovigigun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5fcc02c3c056f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_604cd6a36a350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_6001c6db3907b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_60288712a5553.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/4igFOKm/35727403285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5fc58be351733.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/ydVihxY/57294196988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_60431918c7139.pdfIn PDF document text
    • http://pigokakiw.iblogger.org/59742163478.pdfIn PDF document text
    • http://tusalolorow.22web.org/pufuxavivabajalepodam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_60380fdd8c68a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_aa4e7773e98c40c5a4d84747059276c5.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_007ed38810994f23941c68dd2c169a4e.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_b4491156d88949dcb174e383225e0869.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_139ffff7e64c4e61a625b00b656661e3.pdf?index=trueIn PDF document text
    • http://muvusibose.rf.gd/material_safety_data_sheet_means.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_d8c1508c377c4c3bb3251f369135ec3c.pdf?index=trueIn PDF document text
    • http://difofeb.epizy.com/the_odyssey_book_1_2_3_summary.pdfIn PDF document text
    • http://defipezisezujor.rf.gd/57468075567.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5384 bytes
SHA-256: a28ed17d59ba7a7ee4a890ef7ca03159f1e0006fa270b57014964d6f72e1811e
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 11024 bytes
SHA-256: 6f916c3d94141bb01d7e4cf685a0901e85ff86c2cd4771d63502ff914159a32a