Malicious PDF — malware analysis report

Static analysis result for SHA-256 38448ac93c1efcfa…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 09:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d93f94f14ee93e9634f16e04f2a9d3a SHA-1: e935a5ee627a37a6e0b0a34eb50c41d5dcb7cff9 SHA-256: 38448ac93c1efcfaa904dec06cf9d7f73c6b6408fe50df07ba9a8f67833a919c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the overall structure point towards an attempt to redirect users to potentially harmful sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=cal+poly+pomona+class+schedule+2020
    • http://sale20.site/sathuranga_vettai_movie_kuttymovies1tw21.pdf
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/6783416.pdf
    • https://cdn.sqhk.co/vajirasavuz/gifaFhb/souza_sim_drag_race_mod_money.pdf
    • http://lunesygets.xyz/kixidovigagfj8s.pdf
    • https://cdn.sqhk.co/nugunexinazo/RjcYT0C/playroom_decor_ideas.pdf
    • https://cdn.sqhk.co/bipaneri/ds3QOhg/22303268117.pdf
    • https://femerofuvarilef.weebly.com/uploads/1/3/4/0/134012326/8307605.pdf
    • http://itash.space/hypos_and_hypers0vbkf.pdf
    • https://cdn.sqhk.co/bexefoboxevi/i1oeXih/30800275364.pdf
    • https://cdn.sqhk.co/nimawabej/iGkhgA4/duck_hunting_waders_on_sale.pdf
    • https://cdn.sqhk.co/sononipo/pYJhbzj/surah_yaseen_audio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_4d9a657a9a764c01a38ec40b83fd796d.pdf?index=true
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_d39b8ab0d77f43259a341496df201f60.pdf?index=true
    • http://zelagipu.rf.gd/jalolobumomomek.pdf
    • http://tolisukik.epizy.com/newukarasizomapidofa.pdf
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_1cc7f20a899a46bcafb35ba8a1057b97.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_f185652f049e48f992cedec63b1cf92b.pdf?index=true
    • http://bejuxufuvojofa.rf.gd/17852267095.pdf
    • http://kinuvafarugabob.rf.gd/akreditasi_puskesmas_bab_4.pdf
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_737ff0e8e8ab4ca79e4ec4c9af0fb3c6.pdf?index=true
    • http://zerodawoti.rf.gd/13998865003.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e364.bin
fe4b2d6cdf8ab161c0258f455b67eade27a8b093bc21b1d3189e362a087d6778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 5372 bytes
font_01_sfnt_off0000f57b.bin
15c6b023efb227ef3ff27f051c0381c152a5a0011fcfb0a74ffbef69636790f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10468 bytes
font_02_sfnt_off00011947.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 4324 bytes

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