Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6fe036517900e2…

MALICIOUS

PDF

74.3 KB Created: 2021-03-23 21:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1b28b886619521b7b70e7382662768f5 SHA-1: 2de9439e9bde84ee87eb5ba0b96e088e24f0b316 SHA-256: ad6fe036517900e2257727e24171e39e874b688e3591b8a2dc43926fa06e377e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.8092

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=solving+quadratic+equations+questions+with+answers PDF link annotation
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/pozixilejun_xebinevebador_bimasenojem_gowizopogukigox.pdfIn PDF document text
    • https://cdn.sqhk.co/pinufizugal/coihhdU/71992110553.pdfIn PDF document text
    • https://cdn.sqhk.co/pofevadamem/QIxMkhh/lokicraft_download_in_iphone.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/lebajone.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/eM7iage/barixomalamabikiguzujuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_605688a4efd8f.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/5pgw1hh/translate_web_page_add_on_firefox.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/tugederuboveruwam.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/gubabuzut.pdfIn PDF document text
    • https://fijesawe.weebly.com/uploads/1/3/4/6/134630878/acd5f7094.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/pizikovitoruliwibalisixi.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/1129937.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/jfjg3cH/21769045278.pdfIn PDF document text
    • https://cdn.sqhk.co/sewetotab/eqggijJ/best_free_music_download_app_for_android_tablet.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/zipevedutaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5fd3d14965c00.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/64hilgf/pafudafodurara.pdfIn PDF document text
    • http://pukotuv.22web.org/zuberotiwewipikuduvala.pdfIn PDF document text
    • http://leledup.mypressonline.com/85057911335.pdfIn PDF document text
    • https://cdn.sqhk.co/rowavarop/SdIhihb/mexapipibaxijuvitikit.pdfIn PDF document text
    • https://cdn.sqhk.co/wafifovuwel/af47qgh/93619894062.pdfIn PDF document text
    • http://zadunidukutar.iblogger.org/soxonujojusapipilinuduw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorirefojexo.rf.gd/anglican_hymn_book_free_download.pdfIn PDF document text
    • http://xedibotiwunupu.epizy.com/33779464198.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 5580 bytes
SHA-256: 33fafe0fbcc93d28b4264930d15ebb81c2f5448133af788be474a54c8a4d8d5c
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 10584 bytes
SHA-256: 7e4150ac135376f481168f8fbd22c872b0d060db9e92fda19579b2525bcbe6cd

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