Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f029cf14389cce…

MALICIOUS

PDF

143.0 KB Created: 2021-03-17 14:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41c45644dc2581d909a7844d0f504be6 SHA-1: 892218b3d2664af9bef78ccd434bc9322fd58c44 SHA-256: 23f029cf14389cceaf43a24d0769843377b47d7ae7a2b85f98c9bc09dd5ad663
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=american+history+by+judith+ortiz+cofer+answers PDF link annotation
    • https://cdn.sqhk.co/bubiwalifeda/bEdjaja/light_yellow_color_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/geZgdih/ben_10_ultimate_wallpaper_hd_free_download.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/2c78424ddfb.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/bifSifD/41449190001.pdfIn PDF document text
    • http://zawuruliwisevo.iblogger.org/kewuwexuvise.pdfIn PDF document text
    • http://pagipuniluti.iblogger.org/7537976012.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/latukorulabojobaboz.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/gUyeGQP/kixobujabejufuvivug.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/icBwibW/shadow_fight_2_special_edition_free_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/egdpQje/belebafevirumarevasig.pdfIn PDF document text
    • https://demavagof.weebly.com/uploads/1/3/4/0/134017100/9c04c.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/c3icifX/14947367366.pdfIn PDF document text
    • http://ketorebagibof.22web.org/96141668996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_03c26ca58cd949f4974750d18d7d49c4.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a1bac016c53c4f4db44fe325f5956f18.pdf?index=trueIn PDF document text
    • http://ritazedaji.epizy.com/walmart_covid_vaccine_florida_sign_up.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_1dcc0c0fa8f64e5bb14f69d3d1cc3c09.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_c2f3123ac2a44f96976c2bb663570e6e.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_ea21fc0f37504a21978b05e9082e5480.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_0470805857eb43b2a41353ef5c88cbad.pdf?index=trueIn PDF document text
    • http://pidawuz.epizy.com/fanekedawudasilejijar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F21D 5676 bytes
SHA-256: 5d03ddefa6af6ff0bc92c92c19d0e8a01020118fdfd925df5fdcac78a21dc2ce
font_01_sfnt_off0002055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2055C 11716 bytes
SHA-256: 6ead93abc945785cb57c331a1a0ee63b1b8ccb222d1826ea57bac2404514509a