Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f497b901ea79af…

MALICIOUS

PDF

76.1 KB Created: 2021-02-24 20:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7c5ebeedd9f280d4c28ac2df8485ffd SHA-1: 40f514d10a6083666f3b0d109da4e2cdec23e8bd SHA-256: 73f497b901ea79afdc8d12517b2ece72ad97dd8bc336f1f45b8995376dbf00e0
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains a large number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, and another identifies it as a link farm. The embedded links likely serve to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=how+to+calculate+cronbach+alpha+manually In PDF document text
    • https://kemiponoza.weebly.com/uploads/1/3/4/6/134605011/7406139.pdfIn PDF document text
    • https://tonirifiw.weebly.com/uploads/1/3/4/4/134468227/nutiguvudo-bojapifala-supugovena.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/can_you_have_2_modems_with_spectrum.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/30431605966.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/6447908.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/2553190.pdfIn PDF document text
    • http://dabuxupufudina.22web.org/gotro_bengali_full_movie_free.pdfIn PDF document text
    • https://gewuvakir.weebly.com/uploads/1/3/4/6/134660990/lojome-muwitapebuwufor-torela-gotepefimenasek.pdfIn PDF document text
    • https://safejabev.weebly.com/uploads/1/3/0/7/130739713/5155284.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/ruteponojogiwo.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/what_is_the_main_idea_of_rumpelstiltskin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memezuxel.epizy.com/helene_berman_size_guide.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/felupegixawuka.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/answer_meaning_and_pronunciation.pdfIn PDF document text
    • http://xuwunokebisul.rf.gd/bebofoxij.pdfIn PDF document text
    • http://bivibepatapa.rf.gd/en_cuanto_tiempo_se_sienten_los_primeros_sintomas_de_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/cozy_house_sheets.pdfIn PDF document text
    • http://fobivojaburako.epizy.com/sijurolumofuvikud.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/carrie_s_war_nina_bawden.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/sutoxeworatebevixejexowu.pdfIn PDF document text
    • http://ziriboxemo.epizy.com/best_vedic_astrology_books.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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5292 bytes
SHA-256: 4e893a83995ce44d2fc4fe9f939aba2cf6806488401eef0a2f9226c3451a9a07
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 11344 bytes
SHA-256: e515ea63f5a5b47c9f9efd8c2e661d2d797c8371cf6c0a529d08850922e37599