Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1814113b4d36c5c…

MALICIOUS

PDF

75.6 KB Created: 2021-03-06 15:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb9fd828d0a6f8a5dda94a834b3ce403 SHA-1: 6627cc159ea7f11e1ecfe9fe1ab603a28608445f SHA-256: e1814113b4d36c5c332c1b1ebb4d6b272c25fa0d100885648f1d3bbf914830ae
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an urgency-based lure. 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 0.9996

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 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://zajinet.ru/strik?utm_term=autocad+3d+printing+free PDF link annotation
    • http://gopidap.scienceontheweb.net/tissot_t_touch_expert_battery_replacement.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/37c820ae008553c.pdfIn PDF document text
    • https://gefidiwe.weebly.com/uploads/1/3/0/7/130738847/sazetubakumupaf.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/nuwebonoza.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/gifzOjd/war_and_order_forum_player_skill_reset.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/drawing_ideas_easy_step_by_step.pdfIn PDF document text
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/5841001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fd0d9de1e5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_603365ba73847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_6038c7fbd9811.pdfIn PDF document text
    • https://kuxodebareku.weebly.com/uploads/1/3/4/0/134042390/vedipogufosefin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_6024fff0c7260.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/presto_cooker_canner_model_21b_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_5feebc36c83b9.pdfIn PDF document text
    • https://ropedali.weebly.com/uploads/1/3/0/9/130969406/loraxonujemepudex.pdfIn PDF document text
    • https://cdn.sqhk.co/rosafipex/SCmaSYL/paper_airplane_toss_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/cgeuig3/garunomavirofudumepa.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/niribupetovofetoxejosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimitafukufes.rf.gd/why_does_my_thermostat_keep_turning_off.pdfIn PDF document text
    • http://wisunabowogus.epizy.com/how_to_share_a_file_on_facebook_page.pdfIn PDF document text
    • http://bokipug.epizy.com/siwopopobomefagugeziki.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/meaning_of_maoist.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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 5268 bytes
SHA-256: 6956c344e468ca0777bf1670b7500199bc44cae58ace702081bb3e705a667b2c
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 10432 bytes
SHA-256: 02fddbed5018478725f109bdf80a2dbad4703a1439d22d7685750ccdca7c8bbc

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