Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d09d0b263d14bc…

MALICIOUS

PDF

86.5 KB Created: 2021-03-09 02:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d3406787a1b4fe15df418567ab8b9d1 SHA-1: 9a58e8e512a58e4d7391b931c16819ed34d98754 SHA-256: 21d09d0b263d14bc73592de8e943b78b6c1fa6260ba4196bfbe9ec3f112778a4
186 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 pointing to disposable hosting, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=uniden+cordless+phones+dect+6.0 PDF link annotation
    • http://moxilekulina.getenjoyment.net/what_is_trauma_literature.pdfIn PDF document text
    • http://groby-ritual.online/dedurujurudinujetikubomtgf.pdfIn PDF document text
    • https://cdn.sqhk.co/nusekabe/djgjjEj/spotify_app_premium_apk.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/fuzovafavosufuvuxepi.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/djilzjj/chess_play_and_learn_apk_old_version.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/guest_relations_director_job_description.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5fecb4f85e3ce.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/wuruxuriwilipobexepozagun.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/lhgKsif/sky_glider_minnesota_state_fair.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_603321f4b5059.pdfIn PDF document text
    • http://alesyasemiletova.com/what_is_the_authors_purpose_for_writing_this_essay_called_outwi07c.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/lgeczSe/19062586090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_600647634e1bd.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/toribilebowavunodaxirofek.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/nghhdhP/35490131206.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://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_07e654a8d1b3467fa551d8ace52df43c.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_a6536a4056a0453880a330161d0b3d87.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_a7032d4f9a3741f79325e2d6c4f85bbc.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_e6bb8d9308954296ba1848461ce23504.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_be045ad832a94893abd5d7761712d535.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_f6a9d0bf9d7944f5bfc762c8dfe3cdf2.pdf?index=trueIn PDF document text
    • https://8fb43ba2-6f0e-41f3-a0a7-39defeeb2330.filesusr.com/ugd/7dd30d_27e0ea6ed9254bce819a39498608acc9.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_c2bee468810144ab9eaaad3ba7970fe0.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_62e287a6349644c28b337e3d14cbdbeb.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_cabb7a5fbdb643dca8aad975df6f5f34.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_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 5060 bytes
SHA-256: 0af1978c1001ae212cddc52d98c4d291e876a73e5f576e1f14d7851ae87469c1
font_01_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 10720 bytes
SHA-256: 74b90fbb8fa8b89ad5948bd319cbd6d8b2d523f956be73e3a4dd39c98f607936
font_02_sfnt_off00013e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176