Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a8ac37a64e4f1c…

MALICIOUS

PDF

79.8 KB Created: 2021-05-13 02:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 66dc00aa82a18b47e73d427d9809d837 SHA-1: 2e56b7a704f7daeede5e7b52d9f530de6d9298bb SHA-256: 50a8ac37a64e4f1c0990cb9adda499ebb7d624d6cdc494bfc99348faf6fb8b1d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://jumiwimov.ru/strik?utm_term=miracle+morning+summary+youtube, is likely intended to redirect users to malicious content or a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • 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://jumiwimov.ru/strik?utm_term=miracle+morning+summary+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366360/normal_606ab453643c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_601b706a4f2a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_60417ed8bb6f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fe68d814e1c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_603df35a7be1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_60557df14bbd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_60178646848ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457332/normal_6004b3f00ce5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5ffb6e6bc463f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_e7499437c5b64451bc6a42514843d52f.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_fe4bb275159745ab96c6e0b807d8a23f.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_404781d7464042988341263ddbbbe180.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_29ca116b2c14449ebd91568331de6be2.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_cb8b64e7f7f440ceb8c934b1303357c9.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_5700bcc617504d71ab9cc0f9ccfcf001.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_7f21387db6cb4572a844b97c971c53a9.pdf?index=trueIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_66abae2a7a524baa88c6735b57325568.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_0974b650be484880b4b1c6f1e2430b31.pdf?index=trueIn 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_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 5364 bytes
SHA-256: 9d17e7f9763f8a37473baeac068a8f6e2f646da04a6257d98d90f12fcbef52ee
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 11104 bytes
SHA-256: ff7998d534d9045017628a8bcbd87a0a6f1aa8bdee75bcf822bffc9596c25dc8