Malicious PDF — malware analysis report

Static analysis result for SHA-256 a004b4077aafc375…

MALICIOUS

PDF

67.9 KB Created: 2021-01-02 12:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ede38990e0a9fed0ffabff8b151ab44b SHA-1: b23e325f6b632c9d133e5ee714f59213a0e7a115 SHA-256: a004b4077aafc375ed7ed3b13f1d4e3700c0ffd91a8472ecd7860aed466af5fa
126 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure for a 'secret video recorder free', indicating a phishing or malware distribution attempt. The presence of external URIs and the overall detection score strongly suggest malicious intent.

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://traffnew.ru/aws?utm_term=secret+video+recorder+free PDF link annotation
    • https://sinosawalebito.weebly.com/uploads/1/3/4/6/134663044/nagitiwexe.pdfIn PDF document text
    • https://cdn.sqhk.co/sobutexe/ijhghih/steps_of_strategic_management_process.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/perejorem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_5f9ef7d236b35.pdfIn PDF document text
    • https://mutevoleronuxo.weebly.com/uploads/1/3/5/3/135351112/bazoruvimive-rovafabenalak.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/tijad-dudikokasigex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce1be78-f577-46f0-925f-510452dbbb5e/13326698235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954996ad-29d0-44df-b0e2-d19cdefe9641/puvubamoduxopiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f44d6ba-3aea-45ae-952e-7ef51c7295a4/dioses_griegos_y_sus_poderes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d4c378-c62e-45a8-a71c-7e1c810e539f/1060251337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5dc348a-62ae-4c87-bcf7-80cd2dbad4ea/36351297656.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/alkaline_songs_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e84717-a69c-4f64-908c-12ad90859094/assurance_wireless_sim_card_unlock_code.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_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 4756 bytes
SHA-256: 1b08368114a1f8c8b07c699603984d354f71eb1b6110fd4a06198125c2a634a4
font_01_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 10936 bytes
SHA-256: e257c5728cdc2a0e85029ba7f60386543aa175f114c01aa7c02ae3448830eac3

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