Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ad4c6d47694999…

MALICIOUS

PDF

84.6 KB Created: 2021-04-11 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 196064e3105e2ca7e29576c7d9dc8cce SHA-1: d923f7fbcd23b033e8b6fcdd559fe7a8f60c544b SHA-256: 88ad4c6d4769499968f7889ba5c315a11b2475826122b94e0d709f89ddb93b71
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9282

Heuristics 5

  • 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.
  • 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 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
  • 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://bologen.ru/strik?utm_term=fearless+taylor+swift+lyrics+espa%25C3%25B1ol
    • https://cdn-cms.f-static.net/uploads/4413862/normal_6026ff1557811.pdf
    • https://cdn-cms.f-static.net/uploads/4456387/normal_602c1486adbe4.pdf
    • http://lulemaxig.iblogger.org/vcf_format_to.pdf
    • https://cdn-cms.f-static.net/uploads/4376609/normal_603f8850ef6c6.pdf
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5fdc4954e92a9.pdf
    • http://wopotirofi.22web.org/which_engineering_has_highest_salary_in_nigeria.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_dfd39160f4834110b63cc5c4305605cb.pdf?index=true
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_463c95ac366c4b5f8791b510bf92b06b.pdf?index=true
    • https://s3.amazonaws.com/fekaduvopigab/33169809988.pdf
    • https://s3.amazonaws.com/fekife/28701967181.pdf
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_6c2e5b8faf7349ceb90cd93db0d7a29a.pdf?index=true
    • http://xuvemotoguno.epizy.com/jotajufed.pdf
    • https://s3.amazonaws.com/bejikefowu/59584120214.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_0b127b7dd11a490a8faf81c8750678fc.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_403b436f4fa54a4c9947fa5599804672.pdf?index=true
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_c744f2a6baae4266aaeede5e0bdab549.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_abc3d94e4f1c429293209cb2f8393c38.pdf?index=true
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_05c6c679f3fa4a6aa18e1f9ca93c9d04.pdf?index=true
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_61cf9ff1c9394b1385d0d83a1534d595.pdf?index=true
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_35236f5318184f9d9c3e4713270a55ec.pdf?index=true
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_490f3b99a6d648ab838ceb854d153e0a.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_d688ea93a4ba4ac396083ec4f9ebcc3f.pdf?index=true
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_af534627795f4c97a76891580c703d6d.pdf?index=true
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fd7.bin
705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 6440 bytes
font_01_sfnt_off00012fcb.bin
5f37f79dd228742b6adda988579bebbbc70211e85797bd74c9ce24f36db036f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 5372 bytes
font_02_sfnt_off000141f2.bin
6c44adf7a6c42a1cac00d5566e6f9e3ce7188c96a64aa0b65d10a6eb20237819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141F2 1864 bytes

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