Malicious PDF — malware analysis report

Static analysis result for SHA-256 838684f220fd1dad…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 12:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ceeea8c4943d4b8fa033a7e42a38a49f SHA-1: 1161448a30a763f9a3ecd92d94979bb9509903f5 SHA-256: 838684f220fd1dad70390415b8800097322003f7ac208b477a25b541e6e175dc
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The document also exhibits social engineering tactics, instructing the user to press Win+R or paste a command, consistent with ClickFix attacks. The embedded URLs and the overall structure suggest an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=windows+server+2012+r2+change+logon+screen In PDF document text
    • https://batoxomaziforu.weebly.com/uploads/1/3/4/7/134708014/kabugevaforabu_duvisita_reniwelegofani.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/pezudiliduxag.pdfIn PDF document text
    • http://expo-kit.ru/pl_sql_if_statement_multiple_conditions5k4f4.pdfIn PDF document text
    • http://tehnotop.site/90079673611iy3zz.pdfIn PDF document text
    • http://boputev.66ghz.com/laluw.pdfIn PDF document text
    • http://bupetud.xyz/beginning_html_xhtml_css_and_javascript_by_jon_duckett8mu5w.pdfIn PDF document text
    • https://wuvenenuw.weebly.com/uploads/1/3/1/3/131383928/gilaxubasuxubim.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/silijunufebuxege4xfgr.pdfIn PDF document text
    • https://tevejokufip.weebly.com/uploads/1/3/0/9/130969131/7650349.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/dalugizexa8vmtx.pdfIn PDF document text
    • https://vusozegaxu.weebly.com/uploads/1/3/0/8/130874635/wupadirid-xefepakewoba-wasoponoziwepov-jurikonexefani.pdfIn PDF document text
    • http://wirelessinfo.ru/hp_puerto_rico_contact_number48isx.pdfIn PDF document text
    • http://gatorama.fun/wamilotexivrvd6y.pdfIn PDF document text
    • http://mini-camera-super.club/55123082880oiyh0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magikid.epizy.com/fafizubuk.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/49618104226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24a26a4-cee4-4359-9afe-82ca8936c907/27564127058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab30173-a91b-4d45-a972-16e1eb5bc9cc/xuzozibulikof.pdfIn PDF document text
    • http://sizujuzefe.epizy.com/puligokojobevim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55dfaa43-8285-4fa5-9c2e-88f5c359cd2e/sofizikuvubepil.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/kezorugowode.pdfIn PDF document text
    • http://jedikofip.rf.gd/how_to_overcome_tragedy_of_the_commons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e389a90-4698-4bcb-a80a-70b71d42a918/93030619319.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 5692 bytes
SHA-256: a3cd9fd1c5e1eeab02201f92579372bff52b62b04af7549f1fd348bd3e608106
font_01_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 10720 bytes
SHA-256: a10fd4550e20d9e4b9d5b48bc7243396f2322f7f847704dc043ef31ee68b4746