Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb14bc6b8dbf3334…

MALICIOUS

PDF

66.1 KB Created: 2021-02-09 05:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 394ec34775e79ac7ff3d84be1e743d65 SHA-1: d8ea1ca4d56ef16e7bf547c788f8accd09ef0f72 SHA-256: fb14bc6b8dbf333477d822bf9295713ed0308d2e1be92365ea10f0061e9f3c57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=ph+virtual+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463272/normal_60187a84d32e4.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/gjbyjda/hyde_app_hider_app_to_hide_apps_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_6021bebc13924.pdfIn PDF document text
    • http://poradoit2.site/dxh_900_hematology_analyzeryjy1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_601cfba7ea039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_6009a73cbf12a.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/Eniaygh/gimofavizusizitanurivawi.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ncjh4jc/bukusuvewuxunajerolate.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/jcihpgf/muturixelogepa.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/hahe9Xn/gardenscapes_level_2550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601b1a94ef3cc.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/hf6haz8/cat_sneezing_watery_eyes_and_runny_nose.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/mamet6akou.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/ugfOojc/next_sword_art_online_episode.pdfIn PDF document text
    • http://love-cosmetics.shop/447536810393itp0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/email_marketing_template_size.pdfIn PDF document text
    • http://sidiwen.epizy.com/worth_it_fitness_dance.pdfIn PDF document text
    • http://fiwemigusa.rf.gd/fluke_287_datasheet.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_off0000c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC596 5068 bytes
SHA-256: 73192159a4451d5d3721db2a5085ffe0c277f2e534501f3fe8eea697f1a680c6
font_01_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 10832 bytes
SHA-256: c6110f9539df7e8f87ff5e7d0d78d32f0bd17aca9a42d0f67df4a74dcc6982f6

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