Malicious PDF — malware analysis report

Static analysis result for SHA-256 384aacc770b4750c…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 08:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 679fa81098d754d53221ea6b85cad705 SHA-1: 7b1e03ec3409811d3eb9aafd6ac3562ec40066cf SHA-256: 384aacc770b4750c5e6ee386834ce10f8d9870b1084801e12775e458b166ad72
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. 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 URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://xezojetit.ru/123?utm_term=bebederos+para+pajaros+manualidades
    • https://lapumutugafi.weebly.com/uploads/1/3/4/6/134601317/ralojezirabomumeb.pdf
    • http://getdouche.xyz/canceles_para_bao_en_forma_de_escuadra2768y.pdf
    • http://rivozuzeno.mywebcommunity.org/69143193602.pdf
    • http://myshoes.moscow/weather_report_for_herndon_va_20170icp1x.pdf
    • http://idealica-ordina.site/ravetexakawapojmaz6u.pdf
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/tapesizirekeni.pdf
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/1618629.pdf
    • https://jedavosezinuli.weebly.com/uploads/1/3/1/4/131438835/mebofazonazavep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_68fbc455c5814291b15642c38254baa0.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_51e12eac8c95498083f926f8551ced3f.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_81df5fc03ae8492abdf237dc93c09b85.pdf?index=true
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_60c99093b2c341c0a7549645f9d44136.pdf?index=true
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_c5dc1fad0a5b4511b33e6b0f1f1abb25.pdf?index=true
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_19a4c5c522e04557a9f85e0e7a1a912a.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_280d91ddd3f44055afee86fd83c9f9c8.pdf?index=true
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_7a74399e995e407daa3c8d995d5421b6.pdf?index=true
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_8d9e9f91c8684dd291bf726bb0b8cbde.pdf?index=true
    • http://woxesizefibugel.atwebpages.com/what_are_the_keywords_for_compare_and_contrast.pdf
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_77e4196fd5fc4cc4b3fed5ab9f8e7d42.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_9f11f989c2f841879f34e6c8a8dc7831.pdf?index=true
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_1f15e9e847b04cf68b8182ce0b71397b.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_6ad23982a42e409dbcf0c9bce2329917.pdf?index=true
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_ca14c16aa3e24fed90e1db67b4fbd571.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011123.bin
ea1969a0f788baacdf40e297a3262bd3215d923eb71ba526a44a517ca1846911
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11123 17716 bytes
font_00_sfnt_off0000dc02.bin
c2770d61e1b2944953a13aff77e8321f0e173fe7c69f2679a4a9c776d73403d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 5368 bytes
font_01_sfnt_off0000ee25.bin
aa6256557d6987456fa8e92dc5d038a88f07a3e9076969a045d9363f1aef5bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10588 bytes