Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bf7457d97f7f49…

MALICIOUS

PDF

95.4 KB Created: 2021-03-29 08:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2740af75887021a919477be6acbc50c3 SHA-1: a8725beb1461a965a7d69b86055d7893c1216363 SHA-256: 73bf7457d97f7f4912a33cde4a1a733b018a2820354de001bf53b1572a498d05
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a specific search query related to job salaries indicates a potential phishing or scam lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/strik?utm_term=software+development+manager+salary+florida PDF link annotation
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/3347009.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/gfC4jfH/learn_to_speak_latin_american_spanish_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/ehcuzhg/11661352157.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/jg7ZwME/5818337258.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/disodurekumesow-likizasapidokam-gatutugix.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/f33c003a98944.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ghcigLW/27543485108.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/ba18cf.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/speaking_activities_for_teenager.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/G7iebyj/flappy_bird_hack_script.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/95fzics/wumilikosivoxibubeliv.pdfIn PDF document text
    • https://xovajuvomupug.weebly.com/uploads/1/3/0/7/130776021/1149630.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/c06b7be5fadd.pdfIn PDF document text
    • https://cdn.sqhk.co/xorakulenido/gzuGieb/html_registration_form_template_bootstrap.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/9483540.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/wepixe.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/c0gdVVx/grand_theft_auto_5_money_cheats_ps4_offline.pdfIn PDF document text
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/nuxudiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/eibVjbP/how_to_claim_share_treats_puregold.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/antigona_completo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa834d10-efae-4d7f-a8ed-2dae5a2ee0d0/86890217934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648eebbb-89e0-4dbd-9d69-0a2d7265b038/lightstream_suntrust_auto_loan_overnight_payoff_address.pdfIn PDF document text
    • http://furafep.onlinewebshop.net/babubeditigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab4d258-b1e4-4842-aea7-23279786f9f6/dopip.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_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 5720 bytes
SHA-256: 1277dee15db134188fe5171dbc09c7f5dc1753c4687545dc0c1a18d04b0f989f
font_01_sfnt_off00014b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B23 10820 bytes
SHA-256: be613ee92b15f0308869feaa7ea6dce3302063233c5e754149b79e560c740fd5