Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baceb526746ae75…

MALICIOUS

PDF

79.6 KB Created: 2021-03-16 07:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 97417ad46cc67fc1210547e76d89bba9 SHA-1: b2cb585e2c06919c75fdf2a7b4b828a655a61585 SHA-256: 4baceb526746ae75b70d4a75084d1675197512ce29d33968b8969639773e0389
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/wix?keyword=fullypcgames+assassin%2527s+creed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457572/normal_602b9ffcb84ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404976/normal_601aadf663a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_604cf19b4e477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fd787259921a.pdfIn PDF document text
    • http://salea.site/vexoxatudonizorafake2y24b.pdfIn PDF document text
    • http://arboozfilm.com/100_chart_printable_4_per_page5g4kh.pdfIn PDF document text
    • http://sarkife.site/how_to_draw_the_surface_of_the_moonhi8t7.pdfIn PDF document text
    • http://tryporte.xyz/is_the_new_living_bible_a_translation_or_a_paraphraserypkv.pdfIn PDF document text
    • http://hugertely.xyz/woodturning_tools_for_sale_second_handf8jma.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/a76aafde-2e93-4950-9ba3-76b5bbb865b3/32301916446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12e1f0d-4e7a-46b0-9aee-ff563757dbe7/1407956412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9593e0b2-7c2f-4a26-a41a-4ea8d23f7095/pejixurak.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_39e378366c7b450ea9606fee4aeae7c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4757a9a-2bda-405a-b035-852a1e6ce32c/restart_wd_my_cloud_ex2_ultra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba11307-75e0-48c8-8c37-0a2437b31851/california_real_estate_final_walk_through_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52dab88b-9802-416f-9604-1f33b8581e10/96954403436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee09be0f-f8ae-4b60-beeb-edce4eef8738/how_to_replace_motor_on_kenmore_90_series_dryer.pdfIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_91860dcda1ae4d4fb2870e7ce2ef4c54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20f5b71-fffb-42b4-bb37-fc8c14468497/15113277803.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_47c4b24b07744441bd785450a7f774df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d42b2a-c34f-4460-bbf7-47b2b62eb3b5/motocross_motorbike_simulator_offroad.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_fdae4b2c694b4e4dae98278f8aab00f5.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_fd7b3d08a4a045b08c26dde5dbec694b.pdf?index=trueIn 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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 5484 bytes
SHA-256: 9be4b2c8d23bba13c7d3a3bddf8e524c74cb48e1c6d2ea841411a3b844ce7a57
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 2512 bytes
SHA-256: 4dce65651168509d23c29733f7150cf533a8e6ef747e4a2aebe96b50709536f0
font_02_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 12104 bytes
SHA-256: 34daa1cd4cbd7f6a5a2e6e42871f320bbb43ef884b2d005129602d87b827f999

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