Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc1e665d541ff3…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 08:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b1d62b10abd02d81082db29c43b06328 SHA-1: 0e2c30b11bd03fedd16381b727831f1bf6c763b5 SHA-256: 25bc1e665d541ff39de0fb6c0a62a988ac2e711588491588fbed47c1e4563d07
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://resalured.ru/wb?keyword=how%20many%20carbs%20are%20in%20starbucks%20strawberry%20acai%20refresher', appears to be a lure to a malicious site. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wb?keyword=how%20many%20carbs%20are%20in%20starbucks%20strawberry%20acai%20refresher PDF link annotation
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/zojasoberu-xumuxamigugewa-lenidadejowaw-doragiwaguvu.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/mmoire_assurance_automobile.pdfIn PDF document text
    • https://xoberaditide.weebly.com/uploads/1/3/4/6/134645794/b0c715a23e7e94.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/rirugivukalonokavu.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/ed5d937aeedf.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/6885442.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/60226858966.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/iifxqig/87996595849.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/fjegdhb/epic_skater_mod_apk_2._0_25.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/2d6ee93261132ac.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/o6hgjex/read-_along_books_with_records.pdfIn PDF document text
    • https://cdn.sqhk.co/fufowomusixi/jgWpmge/diamond_inama_mp4_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/geWEePw/moto_racing_3d_game_online.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/69184901020.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/3038808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tesodefodavi.rf.gd/20918941437.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_10902656cdbd4827b17cd22697e757eb.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_a2966ea11792497ea1a115cc3b271993.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_d0b212e80451450381720c97261d6f4b.pdf?index=trueIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_b165bb879c5546bdad79cb3ea3a0d1e3.pdf?index=trueIn PDF document text
    • http://zemagarekerak.epizy.com/candidate_registration_form_template.pdfIn PDF document text
    • http://fitizoluwa.epizy.com/addie_model_training.pdfIn PDF document text
    • http://potazerupew.rf.gd/notijemaxuxupe.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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 5448 bytes
SHA-256: ba6ff2397097f74d54e2e37abdba48141e60a373a3c36f1c182b75c651c1dd2f
font_01_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 10784 bytes
SHA-256: b3dc4df9c2f91c5a2a00fb24900277a7cfc23a9746ef7d4da6220b821091d55c