Malicious PDF — malware analysis report

Static analysis result for SHA-256 738725d6c6dab737…

MALICIOUS

PDF

89.5 KB Created: 2021-03-15 04:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c2b4a7eab4fefe03df46f346f10270df SHA-1: 12055486b807a3515581356cb7e20fe1a8ee30ea SHA-256: 738725d6c6dab737fa781157575ae41f9654dca541bd3875024450cf2318a0d7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bologen.ru/123?utm_term=angel%2527+s+revenge+korean+drama PDF link annotation
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/togetiwip-zavube.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/wukedupera.pdfIn PDF document text
    • http://jojenulowivot.22web.org/71043991365.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/5f1774220b7e54.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/nerenatizasuwif.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/4654158.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/xoxuwesozomi-bufobupelifuki-pugobajajumiv-kezamadatoxipu.pdfIn PDF document text
    • https://kobejepofefes.weebly.com/uploads/1/3/5/3/135317692/fubowufowe_pasarav_banakemuwumuwip_gedenib.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/sakog_sodeditibabepad_lufifi_kupafafi.pdfIn PDF document text
    • https://mejiwixibunoxu.weebly.com/uploads/1/3/4/4/134402053/biborerogebagebofi.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/lezusunaxolisu-goroline-nomewe-gelemupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokutefuto.epizy.com/what_is_meant_by_management_skills.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_1e685a4135b54604ae1909c100f986b9.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c3a263963eb74cf584c7c7250063f0af.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_b7a7630c738d4639be8d1007cf0ce4f9.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_f66af7b2b5f24ec38960e9e64a61388d.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_8d5e990b809b46508b1198192cbd2021.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_eda0d7def4584ee6b567bd6032cddce5.pdf?index=trueIn PDF document text
    • http://jusejafek.rf.gd/40798988402.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_eb06139d3e4d41c8aa784a8c5b4d37ea.pdf?index=trueIn PDF document text
    • http://febagilelefejen.epizy.com/sixunepawulosaliwixubi.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_3a1177ab111d45b09323741de40589ec.pdf?index=trueIn PDF document text
    • http://fuverojipu.rf.gd/free_online_google_sketchup_tutorials.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_ea54e7dcc36f47d39dc76d492740bfc6.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_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 7016 bytes
SHA-256: 20d15249bf2e57e5f2e17a63cb7ef7c432573d9057c45203206e85d9a16e895b
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 5292 bytes
SHA-256: da3d48ee51fd503cecfc9d89b07864c5b0e9acfece8e9b472fedf1f8743784a7
font_02_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 11764 bytes
SHA-256: 3be8762bd655f1aad42da4f6c7cbceb4271b5b413d93428bdbe0bb6572440166