Malicious PDF — malware analysis report

Static analysis result for SHA-256 608c628b5b22f1c7…

MALICIOUS

PDF

71.7 KB Created: 2021-03-24 04:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c56a46602fa1cd315b8dffd16fb8b65 SHA-1: 748588ba25d1b897030a994967a0883cff76b4bb SHA-256: 608c628b5b22f1c7a7ffffd4a26ae57980d5d4bcb1d1767f9c083dd3b06c6bed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious content. The embedded document body, though heavily obfuscated, contains text related to downloading free PDFs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://seumenha.ru/strik?utm_term=libro+los+generales+de+dios+3+pdf+descargar+gratis
    • http://lanizimugigil.getenjoyment.net/8085_microprocessor_addressing_modes.pdf
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/0b6f244.pdf
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5ff442990e925.pdf
    • https://cdn-cms.f-static.net/uploads/4384632/normal_600faedc832d3.pdf
    • https://puwowuxavuz.weebly.com/uploads/1/3/2/6/132682233/zuwexa-fupepekuvix.pdf
    • https://cdn-cms.f-static.net/uploads/4452618/normal_6014b98b65339.pdf
    • https://cdn-cms.f-static.net/uploads/4382966/normal_60171de8ab7bf.pdf
    • https://wesarifalonaba.weebly.com/uploads/1/3/5/9/135961423/8877c.pdf
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fccfb8da2633.pdf
    • http://tuduvodakep.mypressonline.com/liluzinig.pdf
    • https://cdn-cms.f-static.net/uploads/4370269/normal_602b6223a833d.pdf
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/dimuponuluj.pdf
    • https://static.s123-cdn-static.com/uploads/4377656/normal_6000a12f6bd38.pdf
    • https://bigufoxorifef.weebly.com/uploads/1/3/1/8/131871864/f24b71a6c2d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_aa48716d3e18476987d8502c29462fdb.pdf?index=true
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_f4c1530a363b46bd8fb8bc0565d87587.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_d786beddf2144e2ea521ada7d7f7e009.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_6fea5a97c3e64e648455da9eaa35d3fc.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_95cdd9c03fa945aaadc293c607c6f8c8.pdf?index=true
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_04783c3cb3cb4d039d2ef34cee62ff6a.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_14609a5486f54fb69de3a820d840c50f.pdf?index=true
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_1b48fca414d54f12a38dcd4e99a13b38.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d889.bin
ff03e5db9b8427054f8fd830e2ec8e198b21f1d7c2bc3d0121fab1ed5e5b5835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 5568 bytes
font_01_sfnt_off0000eb87.bin
dfca71e221ef93c2e6bc1f952edd3a375374edde5c574bda9e8037c58b627ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 10760 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.