Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fead4d08bcd36d2…

MALICIOUS

PDF

82.2 KB Created: 2021-04-27 03:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 02751a67129d398da1c4c4073dfa004b SHA-1: d3aec88abc99149e6dc04ce0d082f8e26f80738f SHA-256: 0fead4d08bcd36d2b6190616ec93e744d3086956cf17e65109b3731176a9f953
186 Risk Score

Malware Insights

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

This PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded URLs. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the heuristic firings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=how+many+hours+do+you+work+part+time+at+starbucks PDF link annotation
    • http://formblckr1.xyz/axes_io_apk_latestqx49o.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/DRgebI7/72906341729.pdfIn PDF document text
    • https://butafujedixixi.weebly.com/uploads/1/3/4/2/134236167/sepemor.pdfIn PDF document text
    • https://vujedivu.weebly.com/uploads/1/3/4/7/134768767/595265.pdfIn PDF document text
    • http://insta-sale.site/2004_ford_focus_zx5_tire_size8tn0g.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/a48de0.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/7d884602ca1c.pdfIn PDF document text
    • https://cdn.sqhk.co/nerawotobiz/Fhd7Nie/radio_italy_free_fm_radio_online_am.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/ggfChey/nakodakak.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ZUjcXjh/31809694859.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
    • https://uploads.strikinglycdn.com/files/473c5698-53c5-4c95-945c-3a93011faf91/20719151576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd37f35f-9810-4f44-a427-782dc5c8456a/jobateduvopegu.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_1d01c4b5bb1b419ea7325f81a3011b6d.pdf?index=trueIn PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_75e71acb81484bd0a4abd3e7ec32abd1.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_03d0ec752d72411eaad621adb8a022ea.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_16e0803905f541d2b37fe683fa9b1d4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9881fce2-90b5-4b7a-ae7b-54f8d23fe19c/canciones_de_la_iglesia_catolica_acordes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afc5bb6-ace6-4e6e-9c17-09e1e45d581f/42738433556.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_c46e4f0d95d34cea922adfb0556c62f5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 5520 bytes
SHA-256: 2c19f6a7a60ddfbb1432b014edc5c3d42f79ee499e317e21eb3c168aedd6c44e
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 11040 bytes
SHA-256: f7959e600b64974b73c1ab806c83662c73127b7b54c5e2c17419d1d295c95fca
font_02_sfnt_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378