Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4708a045a826540…

MALICIOUS

PDF

80.3 KB Created: 2021-04-21 02:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 213f7999b0677891a2c52127692ba519 SHA-1: db2da5ec218d5c21c5ec87c4010be02944b00b2a SHA-256: b4708a045a826540f046af0cfe9898a955655f2b17822e0d6e18862477f4fe06
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a question about therapy costs, which is likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=what+is+a+good+sliding+scale+for+therapy
    • http://bossyonlinex.com/604580092475i63p.pdf
    • https://cdn.sqhk.co/zuzipogowita/gxjj9ic/bawezotefuvafebinajili.pdf
    • http://crubr.space/kufejudamniwi7.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn-cms.f-static.net/uploads/4480162/normal_604b0cefe2814.pdf
    • http://gouliwer.online/nitowabupixuzvexny.pdf
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5fd37cac8d15d.pdf
    • http://bandalet.club/tobekanilili1e0ha.pdf
    • https://cdn.sqhk.co/rabuzopat/ozjce3P/winter_rv_camping_park_city_utah.pdf
    • http://uorott.com/vaseline_petroleum_jelly_sds_sheetsfejo.pdf
    • https://static.s123-cdn-static.com/uploads/4465545/normal_5feb1e41a1952.pdf
    • http://labiosdewonda.com/57220831339okahu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e2b3bcb-52ff-4e32-933c-73cfd9670175/honeywell_thermostat_rth2300b1012.pdf
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_76fe03f9521243d084ae3cd7e6fa4fa0.pdf?index=true
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_d39db5e0e9fd44548b70d88b1b90fcbd.pdf?index=true
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_8b01b05b4629467587d0a6453dcc7b90.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9daf8ae8-f514-45f7-888b-358b2dfc1ae4/15199827808.pdf
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_879215ae1e3a48ab9ea9f30993e99339.pdf?index=true
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_9d91222654d64cbcabb5832aa69be2c7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ad.bin
8895c75ca0e4330c7843480aa483263df47788919a330e409925e06f008010b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 5532 bytes
font_01_sfnt_off00010c8f.bin
b4aea3849ecdce844987f9e26de376ddf84d2df2f91f5b61c13e90668be249c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10952 bytes

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