Malicious PDF — malware analysis report

Static analysis result for SHA-256 545778f98fb6b0e2…

MALICIOUS

PDF

106.6 KB Created: 2021-06-13 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85a55c025d79eede566a4bea39119ca4 SHA-1: 9b25eb17133237cd60e402e7f40d38c4fb20ffac SHA-256: 545778f98fb6b0e2b708673eb0385b0806d117be0ada4525643a8aca09301d78
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 0.9942

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://druttle.ru/123?utm_term=bodhi+linux+3.+0.+0 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5ff86f1b6c84b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_60418cd9dd5fc.pdfIn PDF document text
    • https://zixikaro.weebly.com/uploads/1/3/5/3/135301636/tojusobozosuputad.pdfIn PDF document text
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/wawuzuwajofen_lesabesa_reropet.pdfIn PDF document text
    • https://ninalekenapuboz.weebly.com/uploads/1/3/4/0/134017067/3ff13a7.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/jizipakipanowozil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6017370738458.pdfIn PDF document text
    • https://bokuwiziwa.weebly.com/uploads/1/3/4/0/134042705/bafedi_gilinajesozivof.pdfIn PDF document text
    • https://pikagupulux.weebly.com/uploads/1/3/7/5/137517305/kabozitimune-kasel-dabiliwixovurub-firajemifawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_6061ddf8d22ed.pdfIn PDF document text
    • https://vuzabevewipa.weebly.com/uploads/1/3/6/0/136087677/xaxamebenar-redata.pdfIn PDF document text
    • https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/4864107.pdfIn PDF document text
    • https://jowopuvuramikir.weebly.com/uploads/1/3/5/3/135313070/1bf862a16d236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_605233997cbd6.pdfIn PDF document text
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/valudumipapopim-raxeforafi.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/putil.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/2251202.pdfIn PDF document text
    • https://danerukanem.weebly.com/uploads/1/3/1/3/131398025/ziligilemagowu.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/fawoxujitaliliwaka.pdfIn PDF document text
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/widoxo.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bulafiko.pbworks.com/w/file/fetch/145211916/xotimatizetusasof.pdfIn PDF document text
    • http://lumoxag.pbworks.com/f/8245956992.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/falusibejabogukadi.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/145211910/baixar_jogos_ppsspp_tudo_para_android.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/counting_quarters_nickels_dimes_and_pennies_worksheets.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144882252/9166349505.pdfIn PDF document text
    • http://penezilo.pbworks.com/w/file/fetch/144799797/ferokoti.pdfIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000152ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x152CE 10516 bytes
SHA-256: 33392d67045ab8f25e378d73bd9f04d5e5933c6ccce9d79da25b00f63729c4ac
font_00_sfnt_off0001422a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422A 4884 bytes
SHA-256: c8945f19ee5268734b3e7011f2ed624b41f3e120238b4aaeca668f0c73f381b3
font_02_sfnt_off00017060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17060 13524 bytes
SHA-256: 53ec8d679cb57e0ff81f8402ca7828040213bf1aefdc48458f6a258034865a60