Malicious PDF — malware analysis report

Static analysis result for SHA-256 a336371ba78553e0…

MALICIOUS

PDF

67.8 KB Created: 2021-02-12 22:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 704e26f18bf4aa7f3341020e8cf0b7cf SHA-1: 7a9d691b9e0f2ddf9087b6c3deed238aea8358b2 SHA-256: a336371ba78553e0fa5cb6200213b7ea399edb3bfdcf81e6dd7361b2e2b4f372
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains fragments related to online services and potentially misleading text, reinforcing the phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=free+text+number+online In PDF document text
    • https://cdn.sqhk.co/xisalaximel/hejaiii/sushi_cat_6_unblocked.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/74f2a.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/3721257.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/828b1b563163b69.pdfIn PDF document text
    • http://furniture21.online/bd_singh_genetics_bookrum3e.pdfIn PDF document text
    • http://bigswinner.space/los_4_acuerdos_completo6hm0z.pdfIn PDF document text
    • http://svarka-aurora.online/64225015166nmmfv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_60241af43814c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453117/normal_6005d8dc00285.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/gefof-bavibatape.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/leributafa/fiverupopobir.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/android_os_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/beach_buggy_racing_apk_mod_2.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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 4604 bytes
SHA-256: d8b63340a44d1a52a994a7e7bf3383f01bc5d933ee1aceb09e1d5f3c58c72569
font_01_sfnt_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 10928 bytes
SHA-256: 6f8d58bbc016919492d9712916a31892aaa0ad908dd2c3e4dff505598ef5adbe

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