Malicious PDF — malware analysis report

Static analysis result for SHA-256 960316247b108bab…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 14:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3772f9e35712cc2516e1c8a3abf8038f SHA-1: 98bcdf30f67917988530984223d2147e6e791d62 SHA-256: 960316247b108babcf65446bec6f185c064da804cf06183846142d82f8c032d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing operation. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings strongly indicate an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=descargar+preguntas+ser+bachiller+2018+pdf
    • http://copyright-notice-ig.com/19136052040h1ktb.pdf
    • http://politach.com/jufapisajovozuroxasowomednncl.pdf
    • http://artrosil.xyz/xaripixibewugilo2ze02.pdf
    • http://idealicait.site/roman_catholic_bible_in_tamildc42a.pdf
    • http://lefejot.22web.org/beginning_english_worksheets.pdf
    • http://beach-fruit.fun/2008_jeep_grand_cherokee_ignition_switch_problemsb4f1o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zufaxepixiguxax/71887801308.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/42932165949.pdf
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_f50d34ab5c944aa088e89016a5e93d38.pdf?index=true
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_8ec38d1d0e7d4f12b5e17238655d7792.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_939124d5ff2144d286f13ef08a2cda3a.pdf?index=true
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_b55f4d82cd4241b480439813d8c2a0e8.pdf?index=true
    • https://s3.amazonaws.com/ruzaganog/39594528183.pdf
    • https://s3.amazonaws.com/tisegovofu/autotrader._co._uk_app_android.pdf
    • http://sediredevivos.epizy.com/how_to_reset_super_lifejacket_jolt.pdf
    • https://s3.amazonaws.com/metubevozisul/dremel_4200_parts.pdf
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_7ec7cd2cfc714df2aa7712f7e7fb65b1.pdf?index=true
    • https://s3.amazonaws.com/gowebabuxogiro/battle_of_the_bulge_weather.pdf
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_f3ddc52ec6164c7f9cd1e30967d2c35c.pdf?index=true
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_867f2a28befc47b29707e44a65633373.pdf?index=true
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_0ead3f4c6549416692e6611431ad7a40.pdf?index=true
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_f51d69aa56444cdd8651141e7d857a58.pdf?index=true
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_ee868b6da603463599ae28f2a02bc90a.pdf?index=true
    • https://s3.amazonaws.com/pexodugosa/baraka_da_prince_donda_ndugu_audio.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30e.bin
249a9ae6e1c8134fdebf8b2810c59024509c076f8e91452a18c37324beda947d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 6076 bytes
font_01_sfnt_off0000f7b5.bin
98705076f21397d7b311efa9a3923859693ccde04f46fb7a687134404f3fd325		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 12140 bytes

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