Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a14fe6ff38ab01…

MALICIOUS

PDF

78.8 KB Created: 2021-07-03 19:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a359e5cca2fb37742be182f1767857c9 SHA-1: 2a459a46d46f972afb76aea01db2f756efd8f30a SHA-256: e5a14fe6ff38ab01b2fce7466a3e09ad1f16ca5d9c5bfd58948b395f00b5c86e
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are benign-looking documents, but one URL points to a site that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/wb?keyword=amplificadores%20de%20sonido%20profesionales
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/fabuminaki.pdf
    • https://tonesokesimo.weebly.com/uploads/1/3/4/7/134757712/sozogusozubus.pdf
    • https://fifurinirolegif.weebly.com/uploads/1/3/5/3/135306558/1934415.pdf
    • https://fonamajubeb.weebly.com/uploads/1/3/4/4/134474676/piluxotudogate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ff491ab6-5370-4a89-b9c2-73767f8da85d/melipopegerobaw.pdf
    • http://pesivav.pbworks.com/f/spider_man_game_free_download_for_android.pdf
    • https://uploads.strikinglycdn.com/files/09c0cbcd-7976-460f-a157-e1b6ebfc2dae/frozen_full_movie_in_tamil_dubbed_download_hd.pdf
    • https://uploads.strikinglycdn.com/files/645d27cd-2910-4f41-afba-eedf409260a3/kuwuge.pdf
    • https://uploads.strikinglycdn.com/files/4a7baa22-7d69-4ecb-b136-5de3b461219e/atwood_water_heater_gc6aa-10e_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/f76e3594-214c-4687-94df-48ea8600fe38/15507202276.pdf
    • https://uploads.strikinglycdn.com/files/faf6ec74-a64c-4e13-a60e-b3edfaa9da59/que_es_un_cuestionario_segun_sampieri.pdf
    • https://uploads.strikinglycdn.com/files/7b7aef50-80fd-42c9-8040-dce92da5a53a/how_to_find_post_office_phone_number.pdf
    • https://uploads.strikinglycdn.com/files/d43e8540-7ced-44a2-bff9-a1904f902fd3/landsat_5_data_users_handbook.pdf
    • http://nimedifi.pbworks.com/f/java_launcher_minecraft_download.pdf
    • https://uploads.strikinglycdn.com/files/16b2507a-62d2-40f2-9cb1-f3ec20b931dd/bubofosedebunevomenavage.pdf
    • http://goxuluk.pbworks.com/w/file/fetch/144665835/food_poisoning_from_panda_express.pdf
    • https://uploads.strikinglycdn.com/files/c54b76a4-c80c-4713-8938-c2cf682b158e/frankenstein_1818_text_gutenberg.pdf
    • https://uploads.strikinglycdn.com/files/a0b215fb-c964-47e9-8815-9c86ca5de70c/ratef.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_off0000e52f.bin
d5003feeeb43926401164284bdaccec35778ed7eee0a9420b67286d47bb4f2f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5000 bytes
font_01_sfnt_off0000f601.bin
e0d3372772a7e4c6ed2ff0bee68f67ce544a9760cca4f92197bc6009d75d942f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 12384 bytes
font_02_sfnt_off00011e67.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 4324 bytes

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