Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ce906b7f747159…

MALICIOUS

PDF

73.1 KB Created: 2020-12-17 15:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0938941f2ce0f5d587af96fd098b9096 SHA-1: 71251e85e3c65489aff0c608ac0a47dc377475a9 SHA-256: a4ce906b7f747159c349781f2398255ce7fcab36ee9564fc2cdce3313435b058
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is a link farm designed to direct users to potentially harmful sites, masquerading as a 'full hd movies app' download. While no scripts were extracted, the presence of malicious redirectors and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://traffmen.ru/123?utm_term=full+hd+movies+app In PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/3592415.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/lebelenufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fca614c3ce55.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/murisekixiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fb2da448be63.pdfIn PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/dunajogini.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/kisojemonuxotaka.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/zedupomavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fcf90380d94397de5f981ff/t/5fcfa498509e863c6839c8dc/1607443610711/72998994588.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/public_policy_making_anderson.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5add9f9866f3fd2f487b8/t/5fc959236bd95f39dfcd125a/1607031077385/rozikesotuwekoponaxipuziv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 2968 bytes
SHA-256: abee2b393ec2fb9fec7f30c584fa7e125e99fd0856e0afbe60a6d6a568499c8d
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 4812 bytes
SHA-256: f77bb5999972860720a7c96cf0346b445d3f5c0203016b89dc52ecdaf40df4c9
font_02_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 10696 bytes
SHA-256: ab06e771b59beaab01c85c97d7bb5c84a862a2d59c7f7a025d80b745e1271b2a
font_03_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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