Malicious PDF — malware analysis report

Static analysis result for SHA-256 394bea0b1d399ad4…

MALICIOUS

PDF

75.0 KB Created: 2021-05-02 11:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e81c064c615504711853e0c5bfe36448 SHA-1: 22c8b1c01a439f1d5d462faad6f081230ba31678 SHA-256: 394bea0b1d399ad441c3cf0327ef2f9a4f844cd12e5b90737549e1255a1d0feb
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable domains or potentially malicious content. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. The presence of external links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://baarspo.ru/strik?utm_term=what+are+cool+city+names PDF link annotation
    • https://cdn.sqhk.co/xefilelo/ehchhjb/fuxeti.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/email_writing_exercises_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_604992e63bc10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_5fd9a875a7e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/dLPihia/fall_guys_hexagon_tips.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444098/normal_5fde42a6640be.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/ehfifii/download_lagu_big_bang_bad_boy_mp3_free.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/circuit_diagram_of_amplifier.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/FyojfrI/wawusutinukalomaxufaxal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5fef89c5b1058.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/cgdgcig/lexia_reading_core_5_level_13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_602d9b4fb4c88.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/Ugepyhf/jafodamisometekew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5fe11008cb557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_6012df9003c9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_0935899c99444391a57d31934a73a1a3.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_3b5e115efd1d46358c925c3d7ef02336.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_32ae09ec4c5045f7842d74d84de41613.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_003455f783dd46f3926aa7cfb1ca2546.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_815517d4606d4607881fc6cd1f065fe3.pdf?index=trueIn 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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5156 bytes
SHA-256: d9b2b6362827825c58e966a387422b3bb71079cd863d355e5b23adb7c43b2c93
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10776 bytes
SHA-256: 1ab99b0b1db107af7fd2bd7558a90d6d98ab4868cf5ef83f90b028e9b1ef426f