Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cd4221346d7248…

MALICIOUS

PDF

73.2 KB Created: 2020-12-14 22:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 89f05b8e6158894f3926e975df87ed76 SHA-1: 1c1a2d635cb0b6cf3ec0729aae1726bded069ef5 SHA-256: a4cd4221346d7248eb107f13b5d79ce011f2dceb6dba33db672e07a9b3247c3b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a link to 'cctraff.ru' strongly indicate a phishing or redirection attempt. The 'PDF_SEO_LINK_FARM' heuristic further suggests an attempt to generate traffic to potentially malicious or unwanted sites, with 's3.amazonaws.com/mejawiwomak/download_repelis_plus_pc.pdf' being a prominent example.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=autocad+to+rhino In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5fd7b8a9a64a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_5faa5dca5575a.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/naganoxulum.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/mejawiwomak/download_repelis_plus_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60dd2d51-519f-44b4-93df-7fbdf79f6b4d/multiverse_price_index_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54deebd14ff0dd2b9c4c0/t/5fd69d14c4373837b9148e8b/1607900438447/auxinas_giberelinas_y_citoquininas.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/osrs_fishing_guide_f2p.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/ikea_loft_bed_with_desk_metal.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/92542449363.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/15690933866.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/colors_bangla_tv_serial_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/2239359875.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64A 7852 bytes
SHA-256: 56ff92ba7c469a32c430f0af04dd2e0a8cdba36e321ed05e24c41f90c9be7a22
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 4804 bytes
SHA-256: e0d0f5e9b2a4749249e66e466db6d8c057e520fa9cf3a713d02cdbbfb2ffddac
font_02_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 11900 bytes
SHA-256: 5c14a7df9476680676edf7502e4e3e8e760f1ebb1181319f695ef655c1775016

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