Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7d9a7aba288c52…

MALICIOUS

PDF

59.3 KB Created: 2020-11-25 06:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 971c27802ed391f34690d9e6d75c1c07 SHA-1: d40d7c4976afd6715c67fe1eb2f1b79962437169 SHA-256: af7d9a7aba288c524548b5314083d30ead354dd490e62d4b04b72da6ae9dd8e2
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous links to external websites, many of which are hosted on link farm services like Weebly. The document body, though heavily obfuscated, contains text related to 'Nomao camera apk apkpure', suggesting a lure to download potentially unwanted or malicious software. The presence of redirector links indicates an attempt to funnel users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=nomao+camera+apk++apkpure In PDF document text
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/japezakerer_nizug_wozapuke.pdfIn PDF document text
    • https://wijisozafepu.weebly.com/uploads/1/3/4/3/134356417/kotekulitiji.pdfIn PDF document text
    • https://lokapane.weebly.com/uploads/1/3/4/4/134464640/e2a54013fb68c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_5f9517db4211b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f9a1f89603e6.pdfIn PDF document text
    • https://xojoguxivizu.weebly.com/uploads/1/3/4/0/134096407/0f87ae46.pdfIn PDF document text
    • https://kilekefaze.weebly.com/uploads/1/3/4/6/134631798/pigawarewasasigolofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/roware/mama_might_be_better_off_dead_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/27680046886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5b7844-6e03-40f6-9ea7-ac30def88d76/43543252457.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/27323218034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee257b76-774d-480f-8a48-e32c7a86ac16/alter_ego_5_cahier_d_exercices.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/python_django_interview_questions_and_answers.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_off0000aa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7D 4904 bytes
SHA-256: 3bd6b7a9163e97ed8cf46d3097eaf2fa51d609d6bc14940c070cd1ad653baa64
font_01_sfnt_off0000bb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB16 11792 bytes
SHA-256: 621c7fc73b390c9d0a2e6df309f857f0d3e8689dbc87151a0cee86bcb920e710

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