Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e059444c5181eaf…

MALICIOUS

PDF

79.7 KB Created: 2021-03-14 06:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a85c0093705a670da88af59385b16838 SHA-1: 57c518b5d6581cd69e69acfe263dbe5185d4ced0 SHA-256: 3e059444c5181eafb8c323960b59efa216cd9fc8af3008415e1d2a10cc8fc131
226 Risk Score

Malware Insights

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

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 0.9998

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
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/wix?keyword=boy+scouts+sign PDF link annotation
    • http://pazefezos.mywebcommunity.org/woralawuvuxopu.pdfIn PDF document text
    • http://merishwheelrecords.com/apache_lucene_documentation6801f.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/cuisinart_perfectemp_dcc_3200_reviewstg3st.pdfIn PDF document text
    • http://metazoaapc.fun/company_of_heroes_2_campaign_walkthroughtyueb.pdfIn PDF document text
    • http://mklhhhh.space/solucionario_mecanica_vectorial_para_ingenieros_dinamica_11_edicion_gratisrpfui.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/zekikasipedisefalekalarur.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://uploads.strikinglycdn.com/files/5b07b7d3-5000-4672-befe-4d7374cb32a2/stihl_ms180_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8d0c73-b8c7-4abf-9ec9-ffa2d5d2eed7/buy_invicta_watches_near_me.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_4857a65be0674d809a96b69d9a32a430.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_fb08c65142574c77937ff3f41ddc501e.pdf?index=trueIn PDF document text
    • http://tokipobobanokab.rf.gd/fakafawiwuvivogoxobuvaraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b718e8f4-628d-4a4a-a87e-47367986b3a8/how_to_check_a_36_volt_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fa95c5-7e3a-446d-b21e-1fd19148be88/42211673333.pdfIn PDF document text
    • http://fugodijuw.rf.gd/49322344914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c81d059-3606-4ee2-9fed-14d2e6e36388/how_do_i_become_a_medical_spa_nurse.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_9fbfe5e9fa504b24be0f1e269cdd5c11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/482b17cc-38a1-4edb-85a9-c318d2cb012d/davids_bridal_tuxedo_rental.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 4544 bytes
SHA-256: 3c4b7c642ca8128fa5adee8b4c0b54b9d077f492806838dee1e8bb20f0058ff8
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 11380 bytes
SHA-256: f3224c44ac769f69d94089f02130ef75b16b7f24f157640e77b411f2c3d0f3a1
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3